BAGHDAD, Feb. 1 (Xinhua) -- Three people were killed and seven others injured in two car bombs went off separately in Baghdad on Thursday, a well-informed police source said. A car bomb parking near the Risafi Square in the busy commercial area in central Baghdad went off in the afternoon, killing at least three people and wounding seven others, the source told Xinhua on condition of anonymity. Another car bomb detonated on a main road near a U.S. convoy outside a garage houses U.S. military base in Baghdad's southern district of Doura, the source said.

    It was not clear whether the U.S. troops sustained any casualty as they immediately cordoned off the area preventing the Iraqi police from approaching the scene, the source added. The U.S. military did not confirm the incident yet. Violence persisted in Iraq despite the government's announcement to crack down on illegal militia and the U.S. decision of sending extra 21,000 soldiers to the war-torn country.