Car Bomb Kills at Least 20 at Iraq Academy KIRKUK, Iraq - A suicide attacker detonated a car bomb Saturday outside a police academy in the northern Iraqi city of Kirkuk as hundreds of trainees and civilians were leaving for the day, killing at least 20 people and wounding 36, authorities said.    Separately, U.S and Iraqi forces clashed with insurgents in another part of northern Iraq after launching an operation to destroy an alleged militant cell in the town of Tal Afar, the U.S...