BAGHDAD, Iraq (CNN) -- A U.S. soldier was killed and two were wounded when a military ambulance was hit by a rocket-propelled grenade south of Baghdad, U.S. Central Command said Thursday.
The extent of the injuries was not clear.
The soldiers from the 804th Medical Brigade were transporting a patient injured in another incident to the 28th Combat Army Support Hospital, Central Command said.
"The ambulance was clearly marked with a big red cross," Capt. John Morgan said. "No regard for human life."
The attack took place in the town of Al Iskandariyah, north of Camp Dogwood near the area where a U.S. soldier was killed and another wounded Wednesday in a drive-by attack.
More than 50 U.S. troops have died in hostile fire and accidents since President Bush declared an end to major combat in Iraq on May 1. American forces have launched a major effort to hunt down remaining pockets of resistance, a campaign dubbed Operation Desert Scorpion.
U.S. Defense Secretary Donald Rumsfeld said Wednesday that attacks on U.S. troops by Iraqi "dead-enders" will continue for some time but said he saw no sign of a central or regional organization behind them.
Earlier Thursday, U.S. Central Command announced that one Iraqi was killed and 12 were wounded in a mortar attack on a coalition building north of Baghdad. No U.S. troops were injured in the attack.