Leaked Army Karbala investigation shows Iraqi police collaborated in ambush, killing of US troops. Its key findings were not mentioned by the former White House aide who briefed the press earlier this month in Baghdad.
Update: AP, 7/13: "U.S. troops battled Iraqi police suspected of links to Iranian-backed Shiite militiamen, killing six in a rare firefight between American soldiers and their Iraqi partners. Friday’s clash underscored the deep infiltration of militants in the country’s security forces. ... In addition to the six police officers, seven gunmen were also killed in Friday’s clash in eastern Baghdad, sparked when U.S. troops arrested a police lieutenant, the American military said in a statement. It said the lieutenant was believed to be helping Iran organize Shiite militants and leading a cell involved in bomb and mortar attacks on U.S. and Iraqi troops. ... It was unclear whether the lieutenant was a militiaman who joined the police or a policeman who later joined the militia."