A roadside bomb killed a U.S. soldier Monday in central Baghdad and gunmen ambushed a car carrying American civilians south of the capital, killing one and wounding three others, the U.S. military said. Another American soldier was wounded in the Baghdad attack, which occurred about 9:20 a.m. The victims were part of a three-vehicle military police patrol from the 1st Armored Division, which is due to leave Iraq in the coming weeks and be replaced by the 1st Cavalry Division. On Saturday, gunmen in a white sedan opened fire on a taxi that was taking Americans from a Christian religious group from the ancient city of Babylon back to Baghdad. The three wounded were taken to a hospital in Mahmudiyah. Resistance fighters have been waging a campaign of attacks on U.S. troops and their Iraqi allies and have occasionally targeted aid workers. Robbers also prowl highways outside the capital. ** Saddam Trial not to Start for At Least another Two Years*** Meanwhile, Saddam Hussein is unlikely to stand trial for at least another two years, the Guardian newspaper reported on Monday. The Iraqi special tribunal for crimes against humanity is months away from hearing its first case, and when the trials start in October or November the first defendants to appear will be high-ranking Ba'ath party officials. "I think it will take two years to get to Saddam being tried," said Salem Chalabi, one of the architects of the court and a nephew of Ahmad Chalabi, head of the Iraqi National Congress. The need to select and screen judges, prepare courts and establish well-guarded jails to hold the suspects have led to delays. "There are frustrations," Chalabi was quoted as saying by the British daily. The court has to balance the demand of most Iraqis for a rapid show trial of Saddam and his deputies with the need to establish an impartial model for the new judiciary. **PHOTO CAPTION*** As a sandstorm moves in over central Iraq, U.S. soldiers man a checkpoint near the Iraqi Police Academy complex, in Baghdad, Iraq, Sunday, Feb. 15, 2004. (AP Photo/Brennan Linsley)