Chalabi's spokesman, Entifadh Qanbar, said the ambush occurred in the town of Mahawil, 85 kilometers south of Baghdad, while the convoy was heading to the Shi'ite holy city of Karbala.
In another incident today, Iraqi police said a car bomb exploded at an police checkpoint near Haswa, about 50 kilometers south of Baghdad, killing seven civilians.
In Baghdad, the U.S. military said five American soldiers were killed in bomb attacks yesterday.
(Reuters/AP/AFP/dpa)