Roadside bombs have killed two American soldiers in Iraq - one in Baghdad, the other near the town of Fallujah.

Three other soldiers were wounded by the bomb in Fallujah, a town west of the Iraqi capital where U.S. soldiers have clashed on several occasions with Iraqi insurgents.

The bomb in Baghdad went off in Karrada, a busy shopping area in the capital, and also killed two Iraqi children. Fourteen people were wounded, including five U.S. soldiers, their Iraqi interpreter and eight members of the U.S.-trained Iraqi civil defense force.

Meanwhile, the death toll from Saturday's attacks in the city of Karbala, south of the Iraqi capital, has risen to 18.

Five more Iraqis have died from injuries sustained in the attacks, in which insurgents hit government offices and two military bases of the U.S.-led coalition in Iraq.

The dead include six coalition soldiers - four Bulgarians and two from Thailand. U.S. President George Bush has called Thai Prime Minister Thaksin Shinawatra and Bulgarian Prime Minister Simeon Saxe-Coburg-Gotha to express his condolences over the deaths.

Insurgents used suicide bombers, mortar fire and automatic weapons in the attack, which left more than 170 people wounded, including five American soldiers, and 32 other coalition troops.