BAGHDAD (Reuters) - An Iraqi policeman was killed in a bomb blast near Baghdad and gunmen attacked a U.S. Army patrol in the northern city of Mosul Monday, the latest attacks on Iraq's occupiers and those seen as collaborating with them. The policeman, a bomb disposal expert, was killed when a tank round planted on a busy street in the city of Baquba, 40 miles north of Baghdad, was detonated by remote control, a U.S. military commander in the city said. Iraqi police and others seen to be working or cooperating with U.S. and allied authorities are increasingly the target...