Insurgents launched a deadly ambush Sunday in the guerrilla stronghold of Ramadi (search), killing eight Iraqi National Guardsmen and injuring 18 others, police said.

The Iraqi forces were on patrol in the city center when gunmen opened fire on their convoy around 4:00 p.m., said Capt. Nasser Abdullah from the Anbar provincial police force.

Abdul Moneim Aftan, head of Ramadi General Hospital, said all of the casualties suffered from gunshot wounds.

U.S. and Iraqi troops have been battling insurgents every day for weeks in Ramadi, located 70 miles west of Baghdad.