The U.S. military has released more than 400 male Iraqi prisoners, after an Iraqi-led review board found no reason to continue to keep them in custody.
The releases were announced Saturday. A U.S. statement said that since August 2004 the cases of about 28,000 detainees have been examined and about half of them have been released.
Meanwhile, authorities say a U.S. soldier was killed Saturday by a roadside bomb in Baghdad. Separately, at least three Iraq police were killed in another roadside explosion in the city.
Also, police say the bodies of two blindfolded and bound men were found in Baghdad - apparent victims of reprisal attacks by Shi'ite and Sunni extremists.
The Iraqi Interior Ministry is probing allegations that Shi'ite death squads are operating within Iraqi police ranks.