Security sources told CBS that two Katyusha rockets were fired at the base, and that one had fallen inside the base.
“We can confirm that there was a suspected rocket attack today against US and Coalition forces at Al Asad Airbase, Iraq,” said a Department of Defence spokesperson.
“Initial indications are that several US personnel were injured. Base personnel are conducting a post-attack damage assessment,” the spokesperson added.
It is unclear how many US personnel were injured, or the extent of their injuries.
President Joe Biden was briefed on the suspected attack, a White House official said.
The attack comes after the US carried out a strike in Iraq last week that was described as an act of self-defence against militants who officials said were preparing to launch drones against US and coalition forces in the region.
Tensions have been escalating following the death of Hamas leader Ismail Haniyeh, who was killed in Tehran last Wednesday by a blast at his guesthouse.
Iran’s revolutionary guard (IRGC) has accused Israel of killing Haniyeh and said it was supported by the US. Israel has not commented on Haniyeh’s death.
Also last week, Israel said it killed a top Hezbollah commander in an air strike on a southern suburb of Beirut, Lebanon’s capital.
Both Iran and Hezbollah have threatened to retaliate against Israel for the killings.
The Al Asad base was attacked in January this year by Iranian-backed militias, who launched ballistic missiles and rockets – most of which were intercepted, US Central Command said at the time.
A number of US personnel were assessed for traumatic brain injuries after the attack, while at least one Iraqi service member was wounded.
The airbase has been used by the US since 2004, following the invasion of Iraq, and has been visited by former US presidents George W Bush and later Donald Trump.
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