The explosive 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 terrorist attacks, the CNN reported.
The report, one of the most extensive detailing of the CIA's brutal interrogation of Al-Qaeda suspects yet, said the "enhanced interrogation" programs in many cases amounted to torture.
The techniques, according to the report, were "deeply flawed" and often resulted in "fabricated" information.
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."
"That is why I will continue to use my authority as President to make sure we never resort to those methods again," he said.
Obama outlawed enhanced interrogation techniques soon after becoming President in 2009 and admitted in August "we tortured some folks."
US embassies were on alert as committee chair Senator Dianne Feinstein pushed ahead with publication, despite Secretary of State John Kerry warning that it could provoke anger around the world.
