States to justify torture and ill-treatment as a means to protect public safety or avert emergencies in these and all other situations. Similarly, it rejects any religious or traditional justification that would violate this absolute prohibition. The Committee considers that amnesties or other impediments which preclude or indicate unwillingness to provide prompt and fair prosecution and punishment of perpetrators of torture or ill-treatment violate the principle of non-derogability. 6. The Committee reminds all States parties to the Convention of the non-derogable nature of the obligations undertaken by them in ratifying the Convention. In the aftermath of the attacks of 11 September 2001, the Committee specified that the obligations in articles 2 (whereby “no exceptional circumstances whatsoever…may be invoked as a justification of torture”), 15 (prohibiting confessions extorted by torture being admitted in evidence, except against the torturer), and 16 (prohibiting cruel, inhuman or degrading treatment or punishment) are three such provisions that “must be observed in all circumstances”259. The Committee considers that articles 3 to 15 are likewise obligatory as applied to both torture and ill-treatment. The Committee recognizes that States parties may choose the measures through which they fulfil these obligations, so long as they are effective and consistent with the object and purpose of the Convention. 7. The Committee also understands that the concept of “any territory under its jurisdiction,” linked as it is with the principle of non-derogability, includes any territory or facilities and must be applied to protect any person, citizen or non-citizen without discrimination subject to the de jure or de facto control of a State party. The Committee emphasizes that the State’s obligation to prevent torture also applies to all persons who act, de jure or de facto, in the name of, in conjunction with, or at the behest of the State party. It is a matter of urgency that each State party should closely monitor its officials and those acting on its behalf and should identify and report to the Committee any incidents of torture or ill-treatment as a consequence of anti-terrorism measures, among others, and the measures taken to investigate, punish, and prevent further torture or ill-treatment in the future, with particular attention to the legal responsibility of both the direct perpetrators and officials in the chain of command, whether by acts of instigation, consent or acquiescence. 259. On 22 November 2001, the Committee adopted a statement in connection with the events of 11 September which was sent to each State party to the Convention (A/57/44, paras. 17-18). Effective investigation of ill-treatment – Guidelines ► Page 110