Hundreds of pages of documents partially declassified by the Justice department on Friday reveal that the FBI was conducting an investigation of overseas CIA prisons.
The documents were released as part of a lawsuit filed by the American Civil Liberties Union and Judicial Watch, a Washington-based advocacy group. Many of them were previously released but some of the censoring has been removed.
In September of 2002, FBI officials visiting an overseas prison run by the CIA found prisoners 'manacled to the ceiling and subjected to blaring music around the clock', according to the documents.
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