Manfred Novak, the United Nations special rapporteur on torture, says if genuine, leaked US files on the Iraq conflict point to clear violations of the UN Convention Against Torture.
He told Today presenter John Humphrys that "under the convention, there is an obligation of states to criminalise every form of torture, whether directly or indirectly and of course to investigate any case, to bring the perpetrators to justice but also to provide the victims with the right to an effective remedy and adequate reparation."
Hundreds of thousands of documents released by the website, Wikileaks, describe how the local security forces ill-treated, abused and sometimes murdered detainees between 2004 and the end of last year.
The Pentagon has said the information published by will strengthen America's enemies.
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