A bomb attack on a U.S. armoured patrol killed three Iraqi civilians and wounded seven on Wednesday in the northern city of Mosul, witnesses, police and hospital officials said. It was not clear if there were any casualties among the Americans, one of whose armoured vehicles was damaged by what witnesses said appeared to be a stationary car bomb. A child and two men were killed, doctors said, according to Reuters. There was scattered violence elsewhere across northern and western areas of Iraq. A car bomb attack on a security checkpoint in the western city of Ramadi damaged a U.S. military vehicle and wounded several Iraqi civilians, police said.