C.         International Humanitarian Law

 

57.        To the extent that terrorist or counter-terrorist actions may give rise to or occur in the context of the use of armed force between states or armed violence between governmental authorities and organized armed groups or between such groups within a state, as described in further detail below, they may implicate the possible application of rules of international humanitarian law in evaluating states’ human rights obligations. This section provides for an introduction to humanitarian law, its scope of application and its basic rules as they presently exist. As observed in the introduction to this report, however, it cannot be ruled out that new manifestations of terrorist violence such as those perpetrated in the United States on September 11, 2001 may lead to future developments in international humanitarian law.

58.        International humanitarian law is a branch of international law that applies in situations of armed conflict and which principally regulates and restrains the conduct of warfare or the use of violence so as to diminish its effects on the victims of the hostilities. The victims of armed conflict who are afforded this protection include civilians, prisoners of war, and any other members of armed forces placed hors de combat by sickness, wounds, detention or any other cause and who have fallen into the hands of an adverse party.[162] 

 

59.        International humanitarian law is applicable during armed conflicts, that is to say whenever there is a resort to armed force between states or low intensity and armed confrontations between State authorities and organized armed groups or between such groups within a State.[163] In this respect, armed conflicts may be of an international or non-international nature, which in turn affects the specific international rules that apply to a conflict. In particular, as will be discussed throughout this report, situations of international armed conflict trigger an extensive and specialized regime of rules and regulations under the 1949 Geneva Conventions and related instruments that impact upon the manner in which international human rights law may be considered to apply to the victims of such conflicts, including prisoners of war, unprivileged combatants and civilians. For their part, internal armed conflicts must also be distinguished from situations of internal tensions and disturbances, such as demonstrations without a concerted plan from the outset or isolated sporadic acts of violence,[164] which are not presently governed by international humanitarian law but rather are covered by universal and regional human rights instruments.[165] In all cases, the determination as to the existence and nature of an armed conflict is an objective one, based upon the nature and degree of hostilities, irrespective of the purpose or motivation underlying the conflict[166] or the qualification by Parties to the conflict.[167]

 

60.        Temporally and geographically, international humanitarian law applies “from the initiation of such armed conflicts and extends beyond the cessation of hostilities until a general conclusion of peace is reached; or, in the case of internal conflicts, a peaceful settlement is achieved. Until that moment, international humanitarian law continues to apply in the whole territory of the warring States or, in the case of internal conflicts, the whole territory under the control of a party, whether or not actual combat takes place there.”[168]

 

61.        In situations of armed conflict, both international human rights law and international humanitarian law apply.[169] Nevertheless, the American Convention and other universal and regional human rights instruments were not designed specifically to regulate armed conflict situations and do not contain specific rules governing the use of force and the means and methods of warfare in that context. Accordingly, in situations of armed conflict, international humanitarian law may serve as lex specialis in interpreting and applying international human rights instruments.[170] For example, both Article 4 of the American Convention and humanitarian law applicable to armed conflicts protect the right to life and, thus, prohibit summary executions in all circumstances. However, reference to Article 4 of the Convention alone may be insufficient to assess whether, in situations of armed conflicts, the right to life has been infringed. This is in part because the Convention is devoid of rules that either define or distinguish civilians from combatants and other military targets. Nor does the Convention specify the circumstances under which it is not illegal, in the context of an armed conflict, to attack a combatant or civilian or when civilian casualties as a consequence of military operations do not imply a violation of international law. Consequently, in such circumstances, one must necessarily look to and apply definitional standards and relevant rules of international humanitarian law as sources of authoritative guidance in the assessment of the respect of the inter-American Instruments in combat situations.[171]

 

62.        It is therefore appropriate, and indeed imperative, for the Commission to consider all relevant international norms, including those of international humanitarian law, while interpreting the international human rights law instruments for which it is responsible.[172] International humanitarian law is also pertinent to the Commission’s interpretation of and application of human rights protection to the extent that, as described previously, states’ treaty obligations in these regimes of international law prescribe interrelated and mutually reinforcing standards of protection.[173]

 

63.        The principal sources of international humanitarian law are the four Geneva Conventions of 1949,[174] their Additional Protocols I[175] and II[176] of 1977, the Hague Conventions of 1899 and 1907 and associated regulations,[177] and the customary laws of war. Most of the provisions of the Hague Conventions,[178] the 1949 Geneva Conventions,[179] and Additional Protocol I,[180] are applicable in international armed conflicts or belligerent occupations, defined as cases of declared war or of any other armed conflict which may arise between two states, even if the state of war is not recognized by one of them, cases of partial or total occupation of the territory of a state by another, even if the said occupation meets with no armed resistance,[181] and, in the case of Additional Protocol I, armed conflicts in which peoples are fighting against colonial domination and alien occupation and against racist regimes in the exercise of their right of self-determination.[182] Article 3 common to the Four Geneva Conventions, on the other hand, was developed to apply to armed conflicts which are not of an international character[183] and has subsequently been interpreted as constituting the minimum standards of international humanitarian law applicable in all armed conflicts.[184] Additional Protocol II,[185] which develops and supplements many of the protections contained in common Article 3, is specifically applicable in a more narrowly defined category of internal armed conflicts, namely those which take place in the territory of a state between its armed forces and dissident armed forces or other organized armed groups which, under responsible command, exercise such control over a part of its territory as to enable them to carry out sustained and concerted military operations and to implement international humanitarian law.[186] Notwithstanding the narrower application of Additional Protocol II, however, certain of its provisions, including the fundamental guarantees under Articles 4, 5 and 6, are considered to develop protections prescribed in common Article 3 and should therefore likewise be considered to apply in all non-international armed conflicts. Virtually every OAS member state has also ratified one or more of the 1949 Geneva Conventions and or other humanitarian law instruments.[187]

 

64.        Much of the treaty law canvassed above is widely considered to constitute customary international law[188] binding on all states,[189] including in particular the 1907 Hague Convention and its annexed Regulations concerning the Laws and Customs of War on Land,[190] the Four Geneva Conventions of 1949[191] including their grave breach provisions[192] and common Article 3,[193] and the core of Additional Protocols I and II,[194] including Articles 51(1), 52(1) and 75 of Additional Protocol I[195] and Articles 4, 5, 6 and 13(2) of Additional Protocol II.[196]

 

65.        In addition, notwithstanding the distinctive regimes of protection that apply to international and non-international armed conflicts, it has been widely recognized that certain norms apply in all armed conflicts regardless of their nature.[197] These include the protections under common Article 3 and their corresponding provisions under Additional Protocol II,[198] as well as:

 

•      The principle of military necessity, which justifies those measures of military violence not forbidden by international law that are necessary and proportionate to securing the prompt submission of the enemy with the least possible expenditure of human and economic resources.[199]

 

•       The principle of humanity,[200] which both complements and inherently limits the doctrine of military necessity. This principle prohibits the infliction of suffering, injury or destruction not actually necessary, i.e. proportionate, for the realization of lawful military purposes.[201] Moreover, the principle of humanity also confirms the basic immunity of civilians from being the object of attack in all armed conflicts. Accordingly, the conduct of hostilities by the parties to all armed conflicts must be carried out within the limits of the prohibitions of international law, including the restraints and protections inherent in the principles of military necessity and humanity.[202]

 

            66.        Inherent in the principles of military necessity and humanity are the principles of proportionality and distinction. The principle of proportionality prohibits an attack which may be expected to cause incidental loss of civilian life, injury to civilians, damage to civilian objects, or a combination thereof, which would be excessive in relation to the concrete and direct military advantage anticipated.[203] In a similar vein, the principle of distinction prohibits, inter alia, the launching of attacks against the civilian population or civilian objects and requires the parties to an armed conflict, at all times, to make a distinction between members of the civilian population and persons actively taking part in the hostilities or civilian objects and military objectives,[204] and to direct their attacks only against persons actively taking part in the hostilities and other legitimate military objectives.[205]

 

67.        While certain norms are common to all armed conflicts regardless of their nature, others are limited to the realm of international armed conflicts as defined in the 1949 Geneva Conventions and Additional Protocol I. Among the most significant of these norms is the notion of the “combatant’s privilege” and the related concept, discussed below, of “prisoner of war status.” A “combatant” is generally defined as a person who directly engages in hostilities by participating in an attack intended to cause physical harm to enemy personnel or objects. A “lawful” or “privileged” combatant is a person authorized by a party to an international armed conflict to engage in hostilities and, as such, is entitled to the protection encompassed in the “combatant’s privilege” as well as the status and protections of a prisoner of war as provided for under the Third Geneva Convention when they have fallen into the power of the enemy.[206] Article 4A of the Third Geneva Convention, which reflects the requirements of the 1899 and 1907 Hague Conventions and is broadly considered to constitute customary international law, prescribes the categories of privileged combatants as encompassing the following:

 

1.             Members of the armed forces of a Party to the conflict as well as members of militias or volunteer corps forming part of such armed forces.

2.             Members of other militias and members of other volunteer corps, including those of organized resistance movements, belonging to a Party to the conflict and operating in or outside their own territory, even if this territory is occupied, provided that such militias or volunteer corps, including such organized resistance movements, fulfill the following conditions:

(a)           That of being commanded by a person responsible for his subordinates;

(b)           That of having a fixed distinctive sign recognizable at a distance;

(c)           That of carrying arms openly;

(d)           That of conducting their operations in accordance with the laws and customs of war.

3.             Members of regular armed forces who profess allegiance to a government or an authority not recognized by the Detaining Power.

4.             Persons who accompany the armed forces without actually being members thereof, such as civilian members of military aircraft crews, war correspondents, supply contractors, members of labour units or of services responsible for the welfare of the armed forces, provided that they have received authorization from the armed forces which they accompany, who shall provide them for that purpose with an identity card similar to the annexed model.

5.             Members of crews, including masters, pilots and apprentices, of the merchant marine and the crews of civil aircraft of the Parties to the conflict, who do not benefit by more favourable treatment under any other provisions of international law.

6.             Inhabitants of a non-occupied territory, who on the approach of the enemy spontaneously take up arms to resist the invading forces, without having had time to form themselves into regular armed units, provided they carry arms openly and respect the laws and customs of war.[207]

 

68.        The combatant’s privilege in turn is in essence a license to kill or wound enemy combatants and destroy other enemy military objectives. A privileged combatant may also cause incidental civilian casualties. A lawful combatant possessing this privilege must be given prisoner of war status, as described below, upon capture and immunity from criminal prosecution under the domestic law of his captor for his hostile acts that do not violate the laws and customs of war. This immunity does not, however, extend to acts that transgress the rules of international law applicable in armed conflict.[208]

 

69.        In converse to this is the status in international armed conflicts of the “unprivileged” combatant, sometimes referred to as an “unlawful combatant”, namely a person who does not have the combatant’s privilege but nevertheless directly participates in hostilities. Such unlawful belligerents include irregular or part-time combatants, such as guerrillas, partisans, and members of resistance movements, who either fail to distinguish themselves from the civilian population at all times while on active duty or otherwise do not fulfill the requirements for privileged combatant status, as well as those privileged combatants who violate the requirements regarding mode of dress, such as regular military personnel who are caught spying while out of uniform. Others falling within the category of unprivileged combatants are civilians, noncombatant personnel in the armed forces, as well as noncombatant members of the armed forces who, in violation of their protected status, actively engage in hostilities.[209] These persons temporarily forfeit their immunity from direct individualized attack during such time as they assume the role of a combatant.[210] It is possible in this connection, however, that once a person qualifies as a combatant, whether regular or irregular, privileged or unprivileged, he or she cannot on demand revert back to civilian status or otherwise alternate between combatant and civilian status.[211] Unlike privileged combatants, unlawful combatants upon capture can be tried and punished under municipal law for their unprivileged belligerency, even if their hostile acts complied with the laws of war. It should also be noted that the term “unlawful” combatant is used only to denote the fact that the person lacks the combatant’s privilege and is not entitled to participate in hostilities. Mere combatancy by such persons is not tantamount to a violation of the laws and customs of war, although their specific hostile acts may qualify as such.

 

70.        Since lawful combatant and prisoner of war status directly flow from the combatant’s privilege, recognition of this privilege is limited under customary and conventional international law to situations of international armed conflict as defined under the 1949 Geneva Conventions and Additional Protocol I. In contrast, a government engaged in a civil war or other kind of internal hostilities is not obliged to accord its armed opponents prisoner of war status since these dissidents do not have the combatant’s privilege. Such governments therefore are free to prosecute all captured dissidents for sedition and their other violent acts.[212] At the same time, there is no rule of international law that prohibits a government during international armed conflict from according members of dissident armed groups prisoner of war or equivalent status.   

 

71.        With regard to the issue of supervision of compliance with the law of armed conflict, international humanitarian law treaties are to a significant extent self-regulating, as states parties to the treaties undertake to respect and ensure respect for the terms of the agreements through such mechanisms as training, information dissemination, and prescription and enforcement of disciplinary and penal sanctions under domestic law.[213] The terms of the 1949 Geneva Conventions do, however, provide for two specific external supervisory mechanisms: the Protecting Powers regime, which is applicable only in international armed conflicts and to-date has never been employed;[214] and the services of the International Committee of the Red Cross, which may be offered and accepted in the context of international or non-international armed conflicts[215] as well as potentially in situations of tensions and disturbances falling short of armed conflict.[216] These mechanisms are supplemented by provisions under the Third and Fourth Geneva Convention and Additional Protocol I which provide for review procedures for the determination of the status and treatment of protected persons under certain circumstances and are discussed in Part III(F) below.[217] Article 90 of Additional Protocol I further provides for an International Fact Finding Commission, whose mandate includes, inter alia, inquiring into any facts alleged to be a grave breach as defined in the Geneva Convention or Protocol I or other serious violations of those instruments in respect of those states parties that have recognized the competence of the Commission in this regard.[218] Finally, it should be recalled that the recently-established International Criminal Court has been provided with jurisdiction to prosecute, inter alia, serious violations of international humanitarian law committed in international and non-international armed conflicts, where the conditions for the admissibility of such violations have been satisfied.[219]  

 

72.        It is also significant to recognize that international humanitarian law differs from international human rights law in terms of the actors whose conduct it regulates and in respect of whom it imposes international legal responsibility. As mentioned in the previous section, international human rights law governs directly the conduct of the state and its agents. Accordingly, certain violations of such norms by the state may imply state responsibility. International humanitarian law also governs the conduct of the state and its agents, but, in addition, that of non-state actors, as it equally applies to and expressly binds all the parties to an armed conflict.[220] In this way, international humanitarian law regulates the behavior of state security forces, dissident armed groups and all of their respective agents and proxies.[221] Moreover, certain violations of international humanitarian law may generate not only state responsibility, but also the individual criminal responsibility of the perpetrator and, under the doctrine of superior or command responsibility,[222] his or her superior.[223] Violations of international humanitarian law by states, groups or persons during a conflict do not, however, affect the continued application of humanitarian law to that conflict nor do they justify violations by opposing parties.[224]


            73.        Although terrorist or counter-terrorist action may give rise to or occur in the context of situations of armed conflict, it must be recalled that the concepts of terrorism and war are distinct. In certain circumstances, terrorist or counter-terrorist actions may involve organized violence of such intensity as to give rise to an armed conflict. Such would be the case, for example, where terrorist or counter-terrorist actions involve resort to armed force between States or low intensity and armed confrontations between a State and a relatively organized armed force or group or between such forces or groups within the territory of a state,[225] which in some cases may take place with the support or connivance of states. In addition to constituting the trigger for an armed conflict, terrorist or counter-terrorist actions may take place as discrete acts within an existing armed conflict. Terrorist violence committed under these circumstances is also subject to international humanitarian law,[226] even if it occurs in territory where combat is not taking place,[227] provided that the incidents are sufficiently linked to the armed conflict.[228] This would clearly be the case, for example, where the terrorist or counter-terrorist acts are committed by agents of a belligerent party against the members or objects of an adverse party.[229] In all circumstances, the specific international humanitarian law norms applicable to terrorist violence will vary depending upon whether they give rise to or take place in the context of a conflict of an international or non-international nature. It is also important to recall that the fact that terrorist acts are perpetrated within the context of an armed conflict does not otherwise affect the legal status of that conflict, although it may, as noted above, render the perpetrator and his or her superior individually criminally responsible for those acts that constitute serious violations of the law and customs of law.

 

74.        The Commission also considers it crucial to note at this stage the importance of determining the status under international humanitarian law of individuals who take part in terrorist violence in the context of international armed conflicts, as it is from this status that the lex specialis of international humanitarian law protections for such individuals will to a significant extent be derived. Specifically, where, in the context of an international armed conflict, individuals take direct part in hostilities by perpetrating or otherwise participating in terrorist violence but do not qualify as lawful combatants,  because, for example, they are not authorized by a party to the conflict to engage in hostilities as provided for under Article 4 of the Third Geneva Convention, they may properly be considered to be unlawful combatants.[230] While these individuals will, as a consequence, not qualify for the protections of the Third or Fourth Geneva Conventions, they will nevertheless be entitled to the minimum standards of protection under Article 75 of Additional Protocol I. 

 

75.        Where, in relation to a terrorist act or situation, an armed conflict cannot be said to exist, terrorist actions or anti-terrorist initiatives would be subject exclusively to international human rights law and domestic law, as described in the previous section.[231]

 

76.        Given the broad focus of the current report, the Commission’s analysis will consider principally those fundamental human rights and humanitarian law protections that are widely considered to constitute a part of customary international law and to be applicable to all armed conflicts. These protections include the core rights common to most international human rights instruments such as the right to life, the right to humane treatment and the right to due process, as well as corresponding protections embodied in specific provisions of international humanitarian treaty law, in particular Article 3 common  to the Four Geneva Conventions,[232] core provisions of Article 75 of Additional Protocol I to the 1949 Geneva Conventions,[233] and Articles 4 to 6 of Additional Protocol II to the 1949 Geneva Conventions.[234] Common Article 3 provides as follows:

 

In the case of armed conflict not of an international character occurring in the territory of one of the High Contracting Parties, each Party to the conflict shall be bound to apply, as a minimum, the following provisions:

 

1.             Persons taking no active part in the hostilities, including members of armed forces who have laid down their arms and those placed hors de combat by sickness, wounds, detention, or any other cause, shall in all circumstances be treated humanely, without any adverse distinction founded on race, colour, religion or faith, sex, birth or wealth, or any other similar criteria. To this end, the following acts are and shall remain prohibited at any time and in any place whatsoever with respect to the above-mentioned persons:

 

(a)           violence to life and person, in particular murder of all kinds, mutilation, cruel treatment and torture;

 

(b)           taking of hostages;

 

(c)           outrages upon personal dignity, in particular humiliating and degrading treatment;

 

(d)           the passing of sentences and the carrying out of executions without previous judgment pronounced by a regularly constituted court, affording all the judicial guarantees which are recognized as indispensable by civilized peoples.

 

2.             The wounded and sick shall be collected and cared for.  An impartial humanitarian body, such as the International Committee of the Red Cross, may offer its services to the Parties to the conflict. The Parties to the conflict should further endeavour to bring into force, by means of special agreements, all or part of the other provisions of the present Convention. The application of the preceding provisions shall not affect the legal status of the Parties to the conflict.

 

77.        This provision contains fundamental guarantees applicable at all times during armed conflicts, for the benefit of persons who do not or no longer take an active part in the hostilities. Similar guarantees, which supplement and develop those under Common Article 3, are provided for by Articles 4 to 6 of Additional Protocol II in respect of persons no longer taking part in the hostilities of a non-international armed conflict, and by Article 75 of Additional Protocol I in respect of persons who are in the power of a party to the conflict to an international armed conflict and who do not benefit from more favorable treatment under the 1949 Conventions or Additional Protocol I, such as certain unprivileged combatants who do not fall within the protection of the Third or Fourth Geneva Convention or Additional Protocol I with respect to states parties to that instrument.[235]

 

            78.        Finally, it should be emphasized that the rules of international humanitarian law are non-derogable, subject to very limited exceptions.[236] As a consequence, the minimum standards prescribed under international humanitarian law cannot be suspended, even if the American Convention might otherwise permit derogation from corresponding protections. Where, for example, international humanitarian law prescribes minimum standards of due process, states cannot rely upon any permissible derogations from this right under international human rights law to avoid respect for these standards in armed conflict situations. This approach is mandated in part by Articles 27 and 29 of the American Convention, which prohibit any measures of derogation that are inconsistent with a state’s other obligations under international law and which foreclose any interpretation of the Convention that restricts the enjoyment of exercise of any right or freedom recognized by virtue of another convention to which a state is a party.

 

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[162] IACHR Report on Colombia (1999), supra note 110, at 74, para. 10.  See also M. Sassoli & A. Bouvier, How does law protect in war, (ICRC, 1999), at p. 67 [hereinafter Sassoli & Bouvier].

[163] Abella Case, supra note 73, para. 152. See similarly International Criminal Tribunal for the Former Yugoslavia, Prosecutor v. Dusko Tadić, IT-94-1, Appeals Chamber, Decision on the Defence Motion for Interlocutory Appeal on Jurisdiction, 2 October 1995, para. 70 [hereinafter Tadić AC Decision Jurisdiction].

[164] See ICRC, Protection and Assistance Activities in Situations Not Covered by International Humanitarian Law, 262 Int’l Rev. Red Cross 9, 13 (1988).

[165] See Hans-Peter Gasser, A Measures of Humanity in Internal Disturbances and Tensions: Proposal for a Code of Conduct, 262 Int’l Rev. Red Cross 38, 42 (1988). See also Declaration of Turku Abo (2 December 1990) (declaring minimum humanitarian standards applicable in all situations, including internal violence, disturbances, tensions, and public emergency, and which cannot be derogated from under any circumstances).

[166] See Abella Case, supra note 73, para. 153.  One narrow exception to his rule is prescribed in Article 1(4) of Additional Protocol I, which incorporates within the classes of conflicts governed by the Protocol “armed conflicts in which peoples are fighting against colonial domination and alien occupation and against racist regimes in the exercise of their right of self-determination”. See Additional Protocol I, supra note 68, Article1(4).

[167] See Article 2 Common to the Geneva Conventions, supra notes 36, 67.

[168] Tadić AC Decision Jurisdiction, supra note 163, at para. 70. See also IACHR Report on Colombia (1999), supra note 110, at 95, Part IV, para. 83.

[169] IACHR Report on Colombia (1999), supra note 110, at 74, Part IV, para. 9. Abella Case, supra note 73, para. 158.

[170] IACHR Report on Colombia (1999), supra note 110, at 74, Chapter IV, paras. 8-11. See also Abella Case, supra note 73, paras. 158-159; Case 11.142, Report Nº 26/97, Arturo Ribón Avilan (Colombia), Annual Report of the IACHR (1997), para 171.

[171] See IACHR Report on Colombia (1999), supra note 110, at 75, Chapter IV, para. 12. See also Abella Case, supra note 73, para. 161.

[172] American Convention on Human Rights, supra note 61, Article 29. See also Advisory Opinion OC-16/99, supra note 129, para. 36 et seq.

[173] See Part II(B). para. 45 (International Human Rights Law), para. F.9. See also American Convention on Human Rights, supra note 61, Article 27 (1) and 29; Additional Protocol I, supra note 68, Article 75 (8); Advisory Opinion OC-1/82, supra note 73; Advisory Opinion OC-16/99, supra note 129, paras. 29 et seq.; Villagran Morales Case, supra note 130, paras. 178-198 (interpreting the American Convention on Human Rights in light of pertinent provisions of the UN Convention on the Rights of the Child, supra note 122).

[174] First Geneva Convention, supra note 67, Second Geneva Convention, supra note 67, Third Geneva Convention, supra note 67, Fourth Geneva Convention, supra note 36.

[175] Additional Protocol I, supra note 68.

[176] Additional Protocol II, supra note 36.

[177] In particular the Fourth Convention respecting the Laws and Customs of War on Land and its annex: Regulation concerning the Laws and Customs of War on Land, 18 October 1907, 3 Martens Nouveau Recueil (ser. 3) 461, 187 Consol. T.S. 227 [hereinafter 1907 Hague Convention and Regulations].

[178] Hague Convention Nº I of July 29, 1899, for the Pacific Settlement of International Disputes, 32 Stat. 1803, T.S. Nº 392; Hague Convention Nº II of July 29, 1899 with Respect to the Laws and Customs of War on Land, 32 Stat. 1803, T.S. Nº 403; Hague Convention Nº III of July 29, 1899, for the Adaptation to Marine Warfare of the Principles of the Geneva Convention of August 22, 1864, 32 Stat. 1827, T.S. Nº 396; Hague Convention Nº IV of July 29, 1899, Prohibiting Launching of Projectiles and Explosives from Balloons, 32 Stat. 1839, T.S. Nº 393; Hague Convention Nº I of October 18, 1907, for the Pacific Settlement of International Disputes, 32 Stat. 2199, T.S. Nº 536; Hague Convention Nº II of October 18, 1907, Respecting the Limitations on the Employment of Force for the Recovery of Contract Debts, 36 Stat. 2241, T.S. Nº 537; Hague Convention No. III of October 18, 11907, Relative to the Opening of Hostilities, 36 Stat. 2259, T.S. Nº 538; Hague Convention Nº IV of October 18, 1907, Respecting the Laws and Customs of War on Land and the Regulation Annexed thereto, supra note 177; Hague Convention V of October 18, 1907, Respecting the Rights and Duties of Neutral Powers and Persons in Case of War on Land, 36 Stat. 2310, T.S. Nº 540; Hague Convention Nº VIII of October 18, 1907, Relative to the Laying of Automatic Submarine Contact Mines, 36 Stat. 2332, T.S. Nº 541; Hague Convention No. IX of October 18, 1907, Concerning Bombardment by Naval Forces in Time of War, 36 Stat. 2351, T.S. Nº 542; Hague Convention Nº X of 18 October 1907, for the Adaptation to Marine Warfare of the Principles of the Geneva Convention, 36 Stat. 2371, T.S. Nº 543; Hague Convention Nº XI of October 18, 1907, Relative to Certain Restrictions with Regard to the Exercise of the Right of Capture in Naval War, 36 Stat. 2396, T.S. Nº 544; Hague Convention Nº XIII of October 18, 1907, Concerning the Rights and Duties of Neutral Powers in Naval War, 36 Stat. 2415, T.S. Nº 545; Hague Convention Nº XIV of October 18, 1907, Prohibiting the Discharge of Projectiles and Explosives From Balloons, 36 Stat. 2439, T.S. Nº 546.

[179] Supra notes 36, 67.

[180] Additional Protocol I, supra note 68.

[181] Article 2 Common to the Four Geneva Conventions, supra notes 36, 67.

[182] Additional Protocol I, supra note 68, Article 2.

[183] Article 3 Common to the Four Geneva Conventions, supra notes 36, 67.

[184] See Tadić AC Decision Jurisdiction, supra note 163, at paras. 97-134.

[185] Additional Protocol II, supra note 36.

[186] Additional Protocol II, supra note 36, Article 1.

[187] Abella Case, supra note 73, para. 162. For OAS member states that are parties to the 1949 Geneva Conventions, see Annex II.

[188] Article 38(1)(b) of the Statute of the International Court of Justice, 26 June 1945, 3 Bevans 1153; North Sea Continental Shelf Cases, 20 February 1969, ICJ Rep. 1969, 3; Nicaragua v. United States, 27 June 1984, ICJ Rep. 1986, 14, at para. 77 [hereinafter ICJ, Nicaragua Case]; Tadić AC Decision Jurisdiction, supra note 163, paras. 96 et seq.

[189] See IACHR Report on Colombia (1999), supra note 110, at 82, Ch. IV, para. 39; Case 11.519, Report Nº 61/99, José Alexis Fuentes Guerrero (Colombia), Annual Report of the IACHR 1998, at para 37; Case 10.488, Report N° 136/99, Ignacio Ellacuria, S.J. y Otros (El Salvador), Annual Report of the IACHR 1999, at para. 159; Case 10.548, Report N° 38/97, Hugo Bustios Saavedra (Peru), Annual Report of the IACHR 1997, at para. 61. See also Report of the Secretary-General pursuant to paragraph 2 of resolution Security Council 808 (1993), UN Doc. S/25704 and Add.1, 3 May 1993; UN Security Council Resolution 827, 25 May 1993 [hereinafter UN Secretary General Report (1993)]; ICJ, Advisory Opinion on the Legality of the Threat or Use of Nuclear Weapons, supra note 73, paras. 79, 84; ICJ, Nicaragua Case, supra note 188, para. 220; Tadić AC Decision Jurisdiction, supra note 162, paras. 98, 102, 112, 134. For a general discussion of customary norms of international humanitarian law, see Theodor Meron, The Humanization of Humanitarian Law, 94 Am. J. Int'l. L. 239 (2000), at 244, 248-250, 275 [hereinafter  Meron, The Humanization of Humanitarian Law]; Theodor Meron, The Continuing Role of Custom in the Formation of International Humanitarian Law, 90 Am. J. Int'l L. 238 (1996) at 239, 244, 247. Other potentially pertinent instruments considered to constitute part of customary international law include the Genocide Convention (Convention on the Prevention and Punishment of the Crime of Genocide, 9 December 1948, 78 U.N.T.S. 277 [hereinafter Genocide Convention]); Statute of the International Military Tribunal at Nuremberg (Agreement for the Prosecution and Punishment of the Major War Criminals of the European Axis, and Charter of the International Military Tribunal, Aug. 8, 1945, 82 U.N.T.S. 280).

[190] See, e.g., Trial of German Major War Criminals, 1946, Cmd. 6964, Misc. Nº 12, at 65 and United States v. Von Leeb, 11 Trials of War Criminals Before the Nuremberg Military Tribunals under Control Council Law Nº 10, at 462 (1950) (recognizing the Hague Regulations of 1907 as norms of customary international law).

[191] Four Geneva Conventions, supra notes 36, 67.

[192] Prosecutor v. Dusko Tadić, Case Nº IT-94-1, Trial Chamber, Opinion and Judgment, 7 May 1997, para. 577 [hereinafter Tadić TC Judgment] (referring to Tadić AC Decision Jurisdiction, supra note 163, and recognizing the customary nature of the Grave Breach provisions of the Four Geneva Conventions). The Tadić Judgment was appealed to the ICTY Appeals Chamber without challenge to this finding. See The Prosecutor v. Duško Tadić, ICTY Appeals Chamber (15 July 1999). See also U.N. GAOR, 3rd Committee, 23rd Session, UN Doc. A/C.3/SR.1534 (1968), UN GAOR, 25th Session, Supp. Nº 28 UN Doc. A/8028 (1970).

[193] See, e.g., ICJ, Nicaragua Case, supra note 188, para. 77; ICTY, Prosecutor v. Delalic, Case Nº IT-96-21-T, Trial Chamber, Judgment, 16 November 1998, paras. 298-306 [hereinafter Celibici TC Judgment], affirmed on this point on appeal, The Prosecutor v. Zejnil Delalić, Zdravko Mucić, Hazim Delić and Esad Landžo, Appeals Chamber Judgment, February 20, 2001 (ICTY), paras. 143-150; ICTR, Prosecutor v. Akayesu, Case Nº ICTR-96-4-T, Trial Chamber I Judgment, 2 September 1998, paras. 604-610 [hereinafter Akayesu, TC Judgment], ICTR Appeals Chamber dismissed appeal June 1, 2001; ICTY, Prosecutor v. Kordic and Cerkez, Case No. IT-95-14/2, Trial Chamber III Decision on the Joint Defence Motion to Dismiss the Amended Indictment for Lack of Jurisdiction based on the limited Jurisdictional Reach of Articles 2 and 3, 2 March 1999, paras. 25-34 [hereinafter Kordic TC Jurisdiction Decision] (recognizing that Article 3 Common to the Four Geneva Conventions constitutes a norm of customary international law).

[194] See, e.g., Tadić AC Decision Jurisdiction, supra note 163, paras. 98, 117 (recognizing that the core of Additional Protocol II constitutes customary international law); Akayesu, TC Judgment, supra note 193, paras. 604-610 (recognizing that Article 4 of Additional Protocol II constitutes customary international law); Kordic TC Jurisdiction Decision, supra note 193, para. 31 (recognizing that Articles 51(2) and 52(1) of Additional Protocol I and Article 13(2) of Additional Protocol II constitute customary international law).

[195] See generally Michael J Matheson, “The United States position on the relation of customary international law to the 1977 Protocols Additional to the 1949 Geneva Conventions” in Martin D. Dupuis, John Q Heywood and Michèle Y.F. Sarko, The Sixth Annual American Red Cross-Washington College of Law Conference on International Humanitarian Law: a Workshop on Customary International Law and the 1977 Protocols Additional to the 1949 Geneva Conventions, 2 Am. U. J. Int’l L. & Pol. 419 (1987) [hereinafter Matheson]. See also Kordic TC Jurisdiction Decision, supra note 193 (recognizing that Articles 51(2) and 52(1) of Additional Protocol I and Article 13(2) of Additional Protocol II constitute customary international law).

[196] See, e.g., Tadić AC Decision Jurisdiction, supra note 163, paras. 98, 117, 132; Kordic TC Jurisdiction Decision, supra note 193 (recognizing that Articles 51(2) and 52(1) of Additional Protocol I and Article 13(2) of Additional Protocol II constitute customary international law). ICJ, Advisory Opinion on the Legality of the Threat or Use of Nuclear Weapons, supra note 73,
para.  84; Matheson, supra note 195.

[197] See, e.g., Tadić AC Decision Jurisdiction, supra note 163, paras. 96-127, citing, inter alia, UN General Assembly Resolution 2444, UN GAOR 23rd Sess., Supp. Nº 18, UN Doc. A/7218 (1968), UN General Assembly Resolution 2675, UN GAOR 25th Sess., Supp. No. 28, UN Doc. A/8028 (1970); IACHR Report on Colombia (1999), supra note 110.

[198] See ICJ, Nicaragua Case, supra note 188, para. 77; Tadić AC Decision Jurisdiction, supra note 163, paras 98, 117, 132.

[199] IACHR Report on Colombia (1999), supra note 110, at 82, Ch. IV, para. 38. See, e.g., 1907 Hague Convention and Regulations, supra note 177, Article 23(g); First Geneva Convention, supra note 67, Article 50 in fine; Second Geneva Convention, supra note 67, Article 51 in fine; Fourth Geneva Convention, supra note 36, Article 147 in fine; Additional Protocol I, supra note 68, Article 51(1) in fine.

[200] See, e.g., Article 3 common to the Four Geneva Conventions; First Geneva Convention, supra note 67, Article 12; Second Geneva Convention, supra note 67, Article 12; Third Geneva Convention, supra note 67, Article 13; Fourth Geneva Convention, supra note 36, Article 14; Additional Protocol I, supra note 68, Article 11; Additional Protocol II, supra note 36, Article 4.

[201] IACHR Report on Colombia (1999), supra note 110, at 82, Ch. IV, para. 38. See, e.g., Arturo Ribón Avilan Case, supra note 170, paras. 134, 136, 140, 141 (considering attacks upon persons who have been placed “hors de combat” to constitute violations of international humanitarian law).

[202] IACHR Report on Colombia (1999), supra note 110, at 82, Ch. IV, para. 38.

[203] IACHR Report on Colombia (1999), supra note 110, at 82, Ch. IV, paras. 40, 77-79 (referring to the standards found in Articles 51 and 52 of Additional Protocol I, supra note 68, and stating that the principle of proportionality

prohibits "[a]n attack which may be expected to cause incidental loss of civilian life, injury to civilians, damage to civilian objects, or a combination thereof, which would be excessive in relation to the concrete and direct military advantage anticipated". This principle imposes […] an additional limitation on the discretion of combatants in deciding whether an object is a military objective […]. Should an attack be expected to cause incidental civilian casualties or damage, the requirement of an anticipated "definite" military advantage is elevated to the more restrictive standard of a "concrete" and "direct" military advantage. Another aspect of the proportionality equation requires that foreseeable injury to civilians and damage to civilian objects not be disproportionate or "excessive" to the anticipated "concrete and direct military advantage". [footnotes omitted]

See also Abella Case, supra note 73, para. 177; Bustios Saavedra Case, supra note 189, para. 61; Fuentes Guerrero Case, supra note 189, paras. 38-39; Ignacio Ellacuria, S.J. y Otros Case, supra note 189, paras. 158-163.

[204] See Additional Protocol I, supra note 68, Article 52 (“(1) Civilian objects shall not be the object of attack or of reprisals. Civilian objects are all objects which are not military objectives as defined in paragraph 2. (2) Attacks shall be limited strictly to military objectives. In so far as objects are concerned, military objectives are limited to those objects which by their nature, location, purpose or use make an effective contribution to military action and whose total or partial destruction, capture or neutralization, in the circumstances ruling at the time, offers a definite military advantage. (3) In case of doubt whether an object which is normally dedicated to civilian purposes, such as a place of worship, a house or other dwelling or a school, is being used to make an effective contribution to military action, it shall be presumed not to be so used”). See also Resolution 2444 (XXIII) of the United Nations General Assembly, on Respect for Human Rights in Armed Conflicts, adopted 19 December 1968, GA Res. 2444, UN GAOR, 23rd Sess., A/RES/23/2444 (1968), in Dietrich Schindler and Jiri Toman, The Laws of Armed Conflicts, 2nd ed., 199 (1981).

[205] See, e.g., Additional Protocol I, supra note 68, Articles 51, 52; Additional Protocol II, supra note 36, Article 13.

[206] See Waldmar Solf, The Status of Combatants in Non-International Armed Conflicts Under Domestic Law and Transnational Practice, 33 Am. U. L. Rev. 53, 59 (1983) [hereinafter Solf, The Status of Combatants].

[207] Third Geneva Convention, supra note 67, Article 4A.  For OAS member states that are parties to Additional Protocol I see Annex II. It should be noted that Articles 43 and 44 of that instrument endeavor to relax the requirements of the Hague and Geneva standards by eliminating the distinction found in the Hague Regulations and the Third Geneva Conventions between regular armed forces and irregular voluntary corps, militias and other organized resistance movement and thereby to provide guerrillas a possibility of attaining privileged combatant status. More particularly, Article 43 of Additional Protocol I incorporates as combatants entitled to the combatants privilege and prisoner of war status “all organized armed forces, groups and units which are under a command responsible to that Party for the conduct of its subordinates, even if that Party is represented by a government or an authority not recognized by an adverse Party. Such armed forces shall be subject to an internal disciplinary system which, inter alia, shall enforce compliance with the rules of international law applicable in armed conflict.” Additional Protocol I, supra note 68, Article 43(1). Article 44(3) of Additional Protocol I further obliges combatants defined under Article 43 to “distinguish themselves from the civilian population while they are engaged in an attack or in a military operation preparatory to an attack. Recognizing, however, that there are situations in armed conflicts where, owing to the nature of the hostilities an armed combatant cannot so distinguish himself, he shall retain his status as a combatant, provided that, in such situations, he carries his arms openly: (a) During each military engagement, and (b) During such time as he is visible to the adversary while he is engaged in a military deployment preceding the launching of an attack in which he is to participate. Acts which comply with the requirements of this paragraph shall not be considered as perfidious within the meaning of Article 37, paragraph 1 (c)". Additional Protocol I, supra note 68, Article 44(3).These provisions have been the subject of controversy among states and have never been applied in the context of an armed conflict, and therefore likely do not constitute a part of customary international law. They nevertheless have relevance for those OAS member states who have ratified Additional Protocol I. It should also be noted that even where the Protocol I standards apply, it is still possible for a combatant to be regarded as forfeiting his or her combatants status and hence entitlement to prisoner of war status by failing to meet the standards under Article 44(3) of the Protocol, namely by failing to carry his arms openly during each military engagement as well as during such time as he is visible to the adversary when he is engaged in a military deployment preceding the launching of an attack. See George Aldrich, Guerilla Combatants and Prisoner of War Status, 31 Am. U. L. Rev. 871, 877-878 (1982 [hereinfater Aldrich (1982)]).

[208] See, e.g., United States v. List (The Hostage Case), Trial of the War Criminals before the Nuremberg Tribunal 1228, 1238 (1950) (stating that “[i]t cannot be questioned that acts done in times of war under the military authority of an enemy cannot involve any criminal liability on the part of officers or soldiers if the acts are not prohibited by the conventional or customary rules of war.”); U.S. Department of War, Instructions for the Government of the Armies of the United States in the Field, General Order Nº 100 (1863) [hereinafter “Lieber Instructions”], Articles 56-57; Third Geneva Convention, supra note 67, Article 87 (providing that “[p]risoners of war may not be sentenced […] to any penalties except those provided for in respect of members of the armed forces of the said power who have committed the same acts.”).

[209] See generally Richard Baxter, So Called Unprivileged Belligerency: Spies, Guerrillas and Saboteurs, Brit. Y.B. Int’l L. (1952).

[210] See Additional Protocol I, supra note 68, Article 51(3) (providing that “[c]ivilians shall enjoy the protection afforded by this section unless and for such time as they take a direct part in hostilities.”). See also ICRC, Commentary on the Additional Protocols of 8 June 1977 to the geneva conventions of 12 August 1949 (ICRC, 1987)  [hereinafter ICRC Commentary on the Additional Protocols], at 619, ¶1944 (noting in respect of the qualification under Article 51(3) of Additional Protocol I that it is “only during such [direct] participation that a civilian loses his immunity and becomes a legitimate target. Once he ceases to participate, the civilian regains his right to […] protection […] and he may no longer be attacked”). See also M. Bothe, K. Partsch & W. Solf, New Rules for Victims of Armed Conflicts: Commentary on the Two 1977 Protocols Additional to the Geneva Conventions of 1949 (1982) [hereinafter New Rules], at 301-302. 

[211] See ICRC Commentary on the Additional Protocols, supra note 210, at 515, ¶ 1677 (confirming in respect of the standards under Article 43 of Additional Protocol I governing combatant status that

any concept of a part-time status, a semi-civilian, semi-military status, a soldier by night and peaceful citizen by day, also disappears. A civilian who is incorporated in an armed organization such as that mentioned in paragraph 1, becomes a member of the military and a combatant throughout the duration of the hostilities (or in any case, until he is permanently demobilized by the responsible command referred to in paragraph 1), whether or not he is in combat, or for the time being armed. If he is wounded, sick or shipwrecked, he is entitled to the protection of the First and Second Conventions (Article 44, paragraph 8), and, if he is captured, he is entitled to the protection of the Third Convention (Article 44, paragraph 1)).

[212] Solf, The Status of Combatants, supra note 206, at 53.

[213] See, e.g., Article 1 Common to the 1949 Geneva Conventions (requiring High Contracting Parties to “respect and ensure respect for” the terms of the Conventions); Fourth Geneva Convention, supra note 36, Article 146 (requiring states parties to enact any legislation necessary to provide for effective penal sanctions for persons committing, or ordering to be committed, any of the grave breaches under the Convention).

[214] See, e.g., Third Geneva Convention, supra note 67, Article 8 (“The present Convention shall be applied with the co-operation and under the scrutiny of the Protecting Powers whose duty it is to safeguard the interests of the Parties to the conflict. For this purpose, the Protecting Powers may appoint, apart from their diplomatic or consular staff, delegates from amongst their own nationals or the nationals of other neutral Powers. The said delegates shall be subject to the approval of the Power with which they are to carry out their duties. The Parties to the conflict shall facilitate to the greatest extent possible the task of the representatives or delegates of the Protecting Powers. The representatives or delegates of the Protecting Powers shall not in any case exceed their mission under the present Convention,. They shall, in particular, take account of the imperative necessities of security of the State wherein they carry out their duties.”). 

[215] See, e.g., Article 3 Common to the 1949 Geneva Conventions (providing, inter alia, that “[a]n impartial humanitarian body, such as the International Committee of the Red Cross, may offer its services to the Parties to the conflict”); Third Geneva Convention, supra note 67, Article 9 (“The provisions of the present Convention constitute no obstacle to the humanitarian activities which the International Committee of the Red Cross or any other impartial humanitarian organization may, subject to the consent of the Parties to the conflict concerned, undertake for the protection of prisoners of war and for their relief.”).

[216] Internal Disturbances and Tensions: A New Humanitarian Approach?, 262 Int’l Rev. Red Cross 3, 4-5 (1988).

[217] See infra Part III(F), paras. 347, 348.

[218] Additional Protocol I, supra note 68, Article 90.

[219] Rome Statute, supra note 31, Articles 5(1)(c), 8.

[220] IACHR Report on Colombia (1999), supra note 110, at 75, Part IV, para. 13.

[221] IACHR Report on Colombia (1999), supra note 110, at 75, Part IV, para. 13.

[222] See, e.g., Additional Protocol I, supra note 68, Article 87; ICTY Statute, supra note 549, Article 7(3).

[223] See, e.g., First Geneva Convention, supra note 67, Article 49; Third Geneva Convention, supra note 67, Article 129; Fourth Geneva Convention, supra note 36, Article 146; Additional Protocol I, supra note 68, Article 85(1).

[224] For humanitarian law treaty provisions governing reprisals, see Third Geneva Convention, supra note 67, Article 13; Fourth Geneva Convention, supra note 36, Article 33; Additional Protocol I, supra note 68, Article 51(6).

[225] Abella Case, supra note 73, para. 152. See also Tadić AC Decision Jurisdiction, supra note 163, para. 70.

[226] The operations of the Kosovo Liberation Army during the 1999 Kosovo War were considered as terrorist activities by the Yugoslav government. Nevertheless, the operations of both the KLA and the Yugoslav forces where subject to international humanitarian law.

[227] As indicated above, during armed conflicts, international humanitarian law applies in the whole territory of the warring states or, in the case of internal conflicts, the whole territory under the control of a party, whether or not actual combat takes place there. Tadić AC Decision Jurisdiction, supra note 163, para. 70. See also IACHR Report on Colombia (1999), supra note 110, at 95, Chapter IV, para. 83.

[228] Tadić TC Judgment, supra note 192, para. 572.

[229] See inter alia, Eric David, Principes de droit des conflits armés, (Bruylant, 1999), at 178 [hereinafter David 1999]. Indeed, certain provisions of international humanitarian law treaties specifically prohibit acts of terrorism committed in the context of armed conflicts. See, e.g., Fourth Geneva Convention, supra note 36, Article 33. 

[230] As noted above, for member states that are parties to Additional Protocol I (see Annex II), Articles 43 and 44 of Additional Protocol I eliminate the distinction found in the Hague Regulations and the Third Geneva Conventions between regular armed forces and irregular voluntary corps, militias and other organized resistance movement and thereby provide guerrillas a possibility of attaining privileged combatant status. Even where the Protocol I standards apply, however, it is still possible for a combatant to be regarded as forfeiting his or her combatants status and hence entitlement to prisoner of war status by failing to meet the standards under Article 44(3) of the Protocol, namely by failing to carry his arms openly during each military engagement as well as during such time as he is visible to the adversary when he is engaged in a military deployment preceding the launching of an attack. See Aldrich (1982) supra note 207, at 871, 877-878.

[231] See supra Part II(B), paragraphs 42, 49.

[232] Four Geneva Conventions, supra notes 36, 67.

[233] Additional Protocol I, supra note 68.

[234] Additional Protocol II, supra note 36.

[235] ICRC Commentary on the Additional Protocols, supra note 210, at 870, para. 3031.

[236] See ICRC Commentary on the Additional Protocols, supra note 210, at 392 et seq, 626, 649, 843-844. Under very specific circumstances, certain rules of international humanitarian law can be the subject of derogation or restriction based upon reasons of national security, military necessity or imperative military reasons. See, e.g., Additional Protocol I, supra note 68, Article 54(5) (providing that “[i]n recognition of the vital requirements of any Party to the conflict in the defense of its national territory against invasion, derogation from the prohibition contained in paragraph 2 [against the attack, destruction, removal or rendering useless objects indispensable to the survival of the civilian population] may be made by a Party to the conflict within such territory under its own control where required by imperative military necessity.”). See also supra Part III(D), paras 247-250