A roadside bomb targeted a US convoy in Abu Ghraib, west of the capital, Baghdad, on Friday.
Earlier in the day, Iraqi sources said that a blast from an explosive device had hit a convoy of the US coalition on a highway in the province of Babylon, without elaborating.
Also on Friday, a blast hit a convoy of the US-led coalition on a highway that connects the Iraqi provinces of Dhi Qar and Basra.
The Friday incidents brought to five the number of incidents in which US convoys were hit in Iraq in the past 24 hours.
On Thursday, two US convoys were targeted in two separate attacks in the Arab country.