8.5 As to the Villafañe brothers' claim under article 7, the Committee has noted the conclusions contained in the decision of 27 April 1992, to the effect that the brothers were subjected to illtreatment by soldiers from the No. 2 Artillery Battalion “La Popa”, including being blindfolded and dunked in a canal. The Committee concludes that José Vicente and Amado Villafañe were tortured, in violation of article 7 of the Covenant. disappearances and violations of the right to life, and to criminally prosecute, try and punish those deemed responsible for such violations. This duty applies a fortiori in cases in which the perpetrators such violations have been identified. 9. The Human Rights Committee, acting in conformity with article 5, paragraph 4, of the Optional Protocol to the International Covenant on Civil and Political Rights, is of the view that the facts before it reveal a violation by the State party of articles 7 and 9 of the Covenant in the case of the Villafañe brothers and of articles 6, 7 and 9 of the Covenant in the cases of Luis Napoleón Torres Crespo, Angel María Torres Arroyo and Antonio Hugues Chaparro Torres. 8.6 Counsel has alleged a violation of article 9 in respect of the three murdered indigenous leaders. The above-mentioned decision of the Human Rights Division concluded that the indigenous leaders' abduction and subsequent detention were illegal (see paras. 7.2 and 7.3 above), as no warrant for their arrest had been issued and no formal charges had been brought against them. The Committee concludes that the authors' detention was both unlawful and arbitrary, violating article 9 of the Covenant. 10. Under article 2, paragraph 3, of the Covenant, the State party has an obligation to ensure that Mr. José Vicente and Mr. Amado Villafañe and the families of the murdered indigenous leaders shall have an effective remedy, which includea compensation for loss and injury. The Committee takes note of the content of decision No. 029/1992, adopted by the Human Rights Division on 29 September 1992, upholding decision No. 006/1192 of 27 April, but urges the State party to expedite the criminal proceedings for the prompt prosecution and trial of the persons responsible for the abduction, torture and death of Mr. Luis Napoleón Torres Crespo, Mr. Angel María Torres Arroyo and Mr. Antonio Hugues Chaparro Torres and of the persons responsible for the abduction and torture of the Villafañe brothers. The State party also has an obligation to ensure that similar events do not occur in the future. 8.7 Counsel has claimed a violation of article 14 of the Covenant in connection with the interrogation of the Villafañe brothers by members of the armed forces and by a civilian with military authorization without the presence of a lawyer and with total disregard for the rules of due process. As no charges were brought against the Villafañe brothers, the Committee considers it appropriate to speak of arbitrary detention rather than unfair trial or unfair proceedings within the meaning of article 14. The Committee accordingly concludes that José Vicente and Amado Villafañe were arbitrarily detained, in violation of article 9 of the Covenant. 8.8 Lastly, the Committee has repeatedly held that the Covenant does not provide that private individuals have a right to demand that the State criminally prosecute another person2. The Committee nevertheless considers that the State party has a duty to investigate thoroughly alleged violations of human rights, particularly enforced 11. Bearing in mind that, by becoming a party to the Optional Protocol, the State party has recognized the competence of the Committee to determine whether there has been a violation of the Covenant or not and that, pursuant to article 2 of the Covenant, the State party has undertaken to ensure to all individuals within its territory and subject to its jurisdiction the rights recognized in the Covenant and to provide effective remedies in cases where a violation has been established, the Committee wishes to receive from the State party, within 90 days, information about the measures taken to give effect to the Committee's Views. 2 See the decisions adopted on cases No. 213/1986 (H.C.M.A. v. the Netherlands), adopted 30 March 1989, para. 11.6; No. 275/1988 (S.E. v. Argentina), adopted 26 March 1990, para. 5.5; Nos. 343-345/1988 (R.A., V.N. et al. v. Argentina), adopted 26 March 1990, para. 5.5. 141