The Red Cross saw US troops imprisoning Iraqis naked in the dark in the Abu Ghraib jail last October and was told by the intelligence officer in charge that it was "part of the process", a leaked report said on Monday.
The International Committee of the Red Cross (ICRC) said it had repeatedly alerted US-led occupation authorities to practices it described as "in some cases tantamount to torture".
The Wall Street Journal published the confidential Red Cross report on its Web site on Monday. The Red Cross confirmed the report is genuine.
The 24-page report, issued in February, concluded "persons deprived of their liberty face the risk of being subjected to a process of physical and psychological coercion, in some cases tantamount to torture, in the early stages of the internment process."
During a visit to Abu Ghraib last October Red Cross delegates witnessed "the practice of keeping persons deprived of their liberty completely naked in totally empty concrete cells and in total darkness," the report said.