BAGHDAD - Two American soldiers were killed and four more were wounded in two separate roadside bomb attacks in Iraq on Monday, the US military said. "A coalition force soldier was killed as a result of injuries sustained from an improvised explosive device in Salaheddin province (north of Baghdad) on Monday," a military statement said. "Two soldiers were wounded."In another roadside mine attack in the central province of Najaf, one soldier died and two more were wounded on Sunday, the US military said.