Nine American soldiers died in explosions north of Baghdad, the U.S. military announced Tuesday after the deadliest single day for U.S. troops in Iraq in nearly a month. Six soldiers died when a bomb exploded Monday near their vehicles during a combat operation in Salahuddin province, The Associated Press quoted the military as saying. Three others were wounded in the blast. Another three soldiers died the same day in a roadside bomb attack in Diyala province northeast of Baghdad.