A US logistics supply convoy including four trucks came under attack by unknown assailants on Saturday night on the Samawah-Diwaniya highway in the south of the Middle Eastern country.
Videos and photos emerged online showing flames consuming three vehicles from the attacked US military convoy.
According to a security source, militants on pickup trucks reached the column, forced it to stop, took Iraqi drivers out of the vehicles, and set the trucks on fire.
The attack on the military convoy, which was heading from Basra to a US base, lasted about six minutes.
The militants then left in an unknown direction, with no casualties reported, the source added.