Iraq exploded in an orgy of violence, the biggest ever since the end of major hostilities last year.
In Pic: Supporters of controversial Iraqi Shia cleric Moqtada al-Sadr rally with weapons and images of the firebrand cleric, April 5, 2004 at their Sadr City headquarters in eastern Baghdad. In a second day of clashes between supporters of al-Sadr and the U.S. coalition forces more than 50 Iraqis were reportedly killed as the U.S. military deployed both tanks and apache helicopter gunships against them.