U.S. and Iraqi troops are conducting joint house-to-house searches looking for three missing members of a U.S. patrol that was attacked today south of Baghdad.
The patrol included seven U.S. soldiers and an Iraqi army interpreter.
Five members were killed.
The military has not said whether the interpreter was among the missing or the dead, citing security concerns.
The attack took place before dawn near Mahmoudiya, a Sunni insurgent stronghold about 20 miles south of the capital.
The area is known as the Triangle of Death, because of frequent insurgent attacks.
After the attack, nearby units reporting hearing explosions and a drone plane spotted two burning vehicles.
An Iraqi army officer says all roads into the city have been closed.
The military has also announced the death of an American soldier wounded in a bomb attack yesterday.