Meanwhile, U.S. military officials in Iraq say troops searching for illegal weapons have discovered a car-bomb "factory" in southern Baghdad.
U.S. officials say soldiers recovered four vehicles that were being equipped to deliver explosives, and took more than 50 people into custody.
The Army says it believes some of the detainees are members of an insurgent cell responsible for roadside bombs that have killed at least two U.S. soldiers.
More than 20 car bombs were detonated in Iraq last month.
North of Baghdad Saturday, dozens of supporters of former Iraqi President Saddam Hussein demonstrated against his trial.