Senate grills abuse report author
A US general who reported on abuse by US forces against detained Iraqis is being questioned by a committee of Congress investigating the scandal.
Maj Gen Antonio Taguba found "numerous incidents of sadistic, blatant, and wanton criminal abuses" in his report.
Correspondents say it has grown ever more embarrassing for George W Bush ahead of the US presidential election later this year and appears to be having a severe effect on the American public's view of the entire Iraq war.
Gen Taguba's report says detainees at Baghdad's Abu Ghraib prison were forced to commit sexual acts, were threatened with torture, rape or attack by dogs, and were hidden from Red Cross visits, "in violation of international law".
The investigation was completed on 3 March, the Pentagon said, but by 4 May the defence secretary had still not read it fully.
The report was originally kept secret but later leaked to the media.
Update: BBC decided to change the headline to "Commanders blamed for Iraq abuses" and rewrite parts of the article.