Two rockets landed Sunday in the countryside near an Iraqi military air base where some U.S. contractors are stationed. There were no fatalities as a result of the shelling.
A preliminary investigation shows that the strike was directed against Balad air base north of Baghdad, but the missiles did not reach the target and landed near the village of Al-Bu Asi in the southeast.
The last raid on Balad Air Base was March 15. At least five rockets hit the base then.
No group has yet claimed responsibility for the raid. Iraqi officials say some Iranian-backed armed groups have previously claimed similar incidents.
U.S. officials accuse Iranian-backed armed groups of regularly firing rockets at U.S. facilities in Iraq, including near the U.S. Embassy in Baghdad.
Iranian-linked paramilitary groups are demanding that all foreign troops, including U.S. troops, which number about 2,500 in Iraq, leave the country.
There are now U.S.-led coalition troops in Iraq, whose mission is to fight Islamic State militants.There is also a NATO-led mission there, training Iraqi security forces.