Gunmen opened fire on vehicles carrying foreign security guards in the northern city of Mosul, killing one foreigner and wounding two others.
A US military spokesman said he had no further information on the nationality of the casualties.
Witnesses said several foreigners had been in the vehicles which came under attack. Several attacks were reported on Saturday in Mosul, 240 miles north of Baghdad.
An American soldier was killed earlier today in Baghdad and three wounded in attacks that also left two civilian vehicles of a type favoured by foreigners blazing on the main airport road.
But as the US occupying authority prepares to hand power to the new Iraqi government at the end of June, violence at last seemed to be abating around Najaf, two months after rebel cleric Moqtada al-Sadr launched a Shi'ite uprising in the south.
