Officials in Iraq say two Iraqi policemen have been killed and several others wounded in separate insurgent attacks in Baghdad.
Security officials say gunmen ambushed a police patrol late Friday in a northern Baghdad suburb, killing two officers and wounding at least two others.
Separately, officials say rebels opened fire on a bus carrying Education Ministry employees, wounding at least four people.
Meanwhile, the U.S. military says a car bomb exploded as a U.S. military convoy passed in the northern city of Mosul. No soldiers were injured in the attack.
U.S. military officials say insurgents in the volatile city of Ramadi, west of Baghdad, used a hospital to launch rocket-propelled grenades and small arms fire at U.S. Marines patrolling the area. Hospital officials denied the claim.
A U.S. soldier has been sentenced to three years in prison for killing an unarmed and injured Iraqi civilian.
Staff Sergeant Johnny Horne was convicted Friday of unpremeditated murder for shooting a severely wounded man in Baghdad's Sadr City, an impoverished neighborhood that was the scene of fierce fighting between U.S.-led forces and insurgents loyal to radical Shi'ite cleric Muqtada al-Sadr.
Horne said he shot the man to "put him out of his misery."
The U.S. soldier was also demoted to the rank of private, ordered to forfeit all pay, and handed a dishonorable discharge.