At least a dozen missiles were fired on Saturday at a military base used by US-led coalition forces in western Iraq.
Al-Asad airbase was targeted by 15 rockets fired from Anbar province, AFP reported.
Reuters said U.S. personnel suffered injuries in the attack.
A US defence official, who also requested anonymity, confirmed that "missiles impacted Al-Asad airbase", adding that a joint damage assessment was under way with coalition and Iraqi forces.
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