Imad Talib lived in a Shiite-dominated district for many years until threats by Shiite militiamen forced the Sunni Arab to move across town. Ahmed Khazim left a mostly Sunni suburb for Sadr City, where his Shiite sect forms the majority. Religiously mixed neighborhoods of this sprawling city are gradually disappearing as sectarian tensions are prompting Shiites and Sunnis to move to areas where they are predominant. Full Story