At least 10 rockets targeted a military base in western Iraq that hosts US-led coalition troops today, the coalition and the Iraqi military said. It was not immediately known if there were any casualties.
The rockets struck Ain al-Asad airbase in Anbar province at 7.20am local time, spokesman Colonel Wayne Marotto said.
Later, the Iraqi military released a statement saying the attack did not cause significant losses and that security forces had found the launch pad used for the missiles. An Iraqi military official said they had been found in the al-Baghdadi area of Anbar, speaking on condition of anonymity because they were not permitted to brief media.
It was the first attack since the US struck Iran-aligned militia targets along the Iraq-Syria border last week, stoking fears of a possible repeat of a series of tit-for-tat attacks that escalated last year, culminating in the US-directed strike that killed Iranian General Qassim Soleimani outside the Baghdad airport.
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The attack targeted the same base where Iran struck with a barrage of missiles in January last year in retaliation for the killing of Soleimani. Dozens of US service members were injured, suffering concussions in that strike.
Today's attack comes two days before Pope Francis' is scheduled to visit Iraq in a much-anticipated trip that will include Baghdad, southern Iraq and the northern city of Irbil.
The US strike along the border had been in response to a spate of rocket attacks that targeted the American presence, including one that killed a coalition contractor from the Philippines outside Irbil airport.
After that attack, the Pentagon said the strike was a "proportionate military response" taken after consulting coalition partners.
Marotto said the Iraqi security forces were leading an investigation into the attack on Ain al-Asad.
US troops in Iraq significantly decreased their presence in the country last year under the Trump administration. The forces withdrew from several Iraqi based across the country to consolidate chiefly in Ain al-Asad and Baghad.
Frequent rocket attacks targeting the heavily fortified Green Zone, which houses the US Embassy, during President Donald Trump's time in office frustrated the administration, leading to threats of embassy closure and escalatory strikes.