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Rally in Sadr City, Baghdad

Sadr supporters hold a banner with images of Muqtada Sadr's father, Grand Ayatollah Mohammed Sadiq al-Sadr, right, and his uncle, Mohammed Baqir al Sadr, during a memorial rally. At the height of the civil war, Muqtada Sadr's Mahdi Army militia was one of Iraq's most powerful groups; the U.S.... Karim Kadim / Associated Press