The CIA’s use of torture was far more “brutal and sadistic” than was disclosed in last year’s controversial US Senate report into the agency’s interrogation techniques, according to new information from a Guantanamo Bay detainee.

The newly declassified accounts of the torture of Majid Khan, a so-called "high value detainee", describe in graphic detail how he was sexually assaulted, hung from a beam for several days without a break and half-drowned in tubs of freezing water.

The descriptions are contained in 27 pages of notes from interviews between Mr Khan and his legal team that were cleared for release by the US government on Tuesday, and first reported by Reuters.

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