A roadside bomb has killed two U.S. soldiers in Baghdad and two Marines died in a vehicle accident in western Iraq, the military said Tuesday.

All four of the troops died Monday, the military said. One of the soldiers was killed at the scene of the bombing, while the other died en route to a hospital. The Marines died in a non-hostile vehicle accident near Taqaddum, about 45 miles west of Baghdad.

Also Tuesday, a car bomb exploded in eastern Baghdad shortly before the resumption of the Saddam Hussein trial, wounding at least one policeman and one civilian, said police Maj. Qusai Ibrahim.

It was unclear if the bombing was timed to coincide with the trial. Iraq's raging insurgency is fueled in part of members of Saddam's former ruling Baath Party.

Saddam and seven others have been accused in the deaths of about 140 Shiites following a failed assassination attempt in 1982 against the former ruler in Dujail, 50 miles north of Baghdad. They could be hanged if convicted.