A car bomb exploded outside a building housing members of a Shi'ite militia associated with the Iraqi government on Sunday, killing a child, police and witnesses said. The early morning blast also wounded six people in the southern city of Basra, a hospital source said. The explosion left a large crater and damaged a building housing members of the Badr movement, which is linked to one of the main Shi'ite parties in the U.S.-backed-government.The attack came as tensions rise among rival Shi'ite groups and political parties from across Iraq's volatile sectarian divide as they jockey for position ahead of December elections. The Iranian-trained Badr movement recently clashed with militiamen loyal to nationalist Shi'ite cleric Moqtada al-Sadr in several cities. Sunni Arabs once dominant under Saddam Hussein have accused the Badr movement of operating government-sanctioned hit squads against Sunnis, a charge denied by both Badr and the government.