The report issued by the Senate Intelligence Committee is a damning condemnation of the tactics -- branded by critics as torture -- the George W Bush administration deployed in the fear-laden days after the September 11, 2001 terror attacks.
It contains grisly details of detainees held in secret overseas facilities being subjected to near drowning, or waterboarding, driven to delirium by days of sleep deprivation, threatened with mock executions and threats to their relatives.
In another passage, the mock executions are included in a section that also mentions techniques like "placing pressure on a detainee's artery... Blowing cigarette or cigar smoke into a detainee's face, using cold water to interrogate detainees, and subjecting a detainee to a 'hard takedown'."
Those "rough" or "hard" takedowns involved CIA officers rushing into a detainee's cell, stripping him naked and running him up and down a long hall while slapping and punching him.
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The report, one of the most extensive detailing of the CIA's brutal interrogation of al-Qaeda suspects yet, said the "enhanced interrogation" programmes in many cases amounted to torture.
Running into about 500 pages, the report is the most detailed analysis yet of the CIA's activities, containing information about the secret detention of at least 119 people and practices.
As the report was released, President Barack Obama admitted that the CIA's actions did significant damage to the American standing in the world and were "contrary to our values."
"At least five CIA detainees were subjected to 'rectal rehydration' or rectal feeding without documented medical necessity," the report said.