A car bomb killed at least six Shia pilgrims south of Baghdad on Saturday, the latest in a wave of attacks that had prompted a fresh warning against civil war in Iraq. The blast near a Shia shrine in the town of Musayib also wounded 16 people, said police Captain Muthana al-MaÂ’amouri. Just two hours earlier, powerful Shia leader Abdul Aziz al-Hakim had urged his followers to stand firm against what he called an Al Qaeda campaign to ignite sectarian civil war with bombings like one on Friday that killed at least 70 people. That triple suicide bombing at the Buratha mosque in Baghdad, the biggest single suicide attack on a Shia target since November 2005, raised fresh fears of a full-blown communal conflict, with the United States, Britain and UN quickly urging Iraqi unity.