Iraqi security forces and allied Shiite militiamen celebrate March 31, 2015, as they hold a flag of the Islamic State group they captured in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq. Iraqi forces battled Islamic State militants holed up in downtown Tikrit, going house to house Tuesday in search of snipers and booby traps, and the prime minister said security forces had reached the heart of the city. (Associated Press) **FILE**
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