A US Marine and soldier were killed by a suicide bomber who infiltrated a line of police recruits in Ramadi, the military said Friday. The two Americans were assigned to the 2nd Marine Division, II Marine Expeditionary Force (Forward), the military said. No further information was released. The suicide bomber on Thursday detonated his explosives among a line of police recruits in Ramadi, killing at least 58, including the US troops, and injuring dozens. A second suicide bomber struck Shiite pilgrims in Karbala, killing 63.