One of the memorandums released on Monday provided the account of an agent who observed “serious physical abuses” in Iraq.
It was dated 25 June – two months after the extent of abuse at Baghdad’s Abu Ghraib prison was revealed – and was marked “urgent” and sent to FBI Director Robert Mueller.
It described strangulation, beatings and the placing of lit cigarettes into detainees’ ears.
Another document said an executive order signed by President George W Bush had authorised techniques such as “sleep management”, stress positions, use of military dogs and sensory deprivation.