BAGHDAD (AP) -- Six bombs exploded in predominantly Shiite sections of the capital Sunday, killing at least 45 people in a renewal of sectarian carnage that set back the U.S. push to pacify Baghdad.

North of Baghdad, two British helicopters crashed after an apparent mid-air collision, killing two service members, U.K. officials said.

The U.S. military announced three U.S. troop deaths -- two soldiers and a Marine killed in separate incidents.

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