BAGHDAD (Reuters) - Two separate roadside bomb blasts in Baghdad killed four U.S. soldiers, the U.S. Army said on Sunday. A spokesman said three soldiers were killed and one wounded in a blast around 10:45 p.m. on Saturday in southeast Baghdad. Another soldier was wounded when a roadside bomb exploded at 6:30 a.m. on Sunday and later died of his wounds. The attacks brought to 389 the number of U.S. soldiers killed in action in Iraq since the start of the war to oust Saddam Hussein