consistent pattern of gross, flagrant or mass violations of human rights. Article 4 1. Each State Party shall ensure that all acts of torture are offences under its criminal law. The same shall apply to an attempt to commit torture and to an act by any person which constitutes complicity or participation in torture. 2. Each State Party shall make these offences punishable by appropriate penalties which take into account their grave nature.” 33. It is common ground in these proceedings that the international prohibition of the use of torture enjoys the enhanced status of a jus cogens or peremptory norm of general international law. For purposes of the Vienna Convention, a peremptory norm of general international law is defined in article 53 to mean “a norm accepted and recognized by the international community of States as a whole as a norm from which no derogation is permitted and which can be modified only by a subsequent norm of general international law having the same character”. In R v Bow Street Metropolitan Stipendiary Magistrate, Ex p Pinochet Ugarte (No 3) [2000] 1 AC 147, 197-199, the jus cogens nature of the international crime of torture, the subject of universal jurisdiction, was recognised. The implications of this finding were fully and authoritatively explained by the International Criminal Tribunal for the Former Yugoslavia in Prosecutor v Furundzija [1998] ICTY 3, 10 December 1998 in a passage which, despite its length, calls for citation (footnotes omitted): “3. Main Features of the Prohibition Against Torture in International Law. 147. There exists today universal revulsion against torture: as a USA Court put it in Filartiga v. Peña-Irala, ‘the torturer has become, like the pirate and the slave trader before him, hostis humani generis, an enemy of all mankind’. This revulsion, as well as the importance States attach to the eradication of torture, has led to the cluster of treaty and customary rules on torture acquiring a particularly high status in the international normative system, a status similar to that of principles such as those prohibiting genocide, slavery, racial discrimination, aggression, the acquisition of territory by force and the forcible suppression of the right of peoples to selfdetermination. The prohibition against torture exhibits -24-