Documents, obtained by the American Civil Liberties Union, from an Army investigation have disclosed the presence of unregistered CIA detainees at Abu Ghraib last September. The Army used the acronym 'OGA' for 'other government agency' to refer almost exclusively to the CIA.
One document refers to an 'OGA' detainee dying under interrogation in September 2003. Another suggests a death occurred in October, while a third said a detainee died while chained in the prison shower. A fourth document refers to a detainee dying from heart problems during interrogation.