WASHINGTON, March 12 — Two American personnel and one from Britain were killed and about a dozen people were wounded when 18 small rockets hit Iraq's Taji military camp north of Baghdad yesterday, US officials told Reuters, speaking on condition of anonymity.

The officials, who cautioned the death toll may rise given the severity of some of the injuries, said it was too soon to assign blame. Any indication that Iran-backed militia were responsible could spark a new round of confrontation between the United States and Iran.

The last military escalation led to a US strike in January that killed top Iranian General Qassem Soleimani, which, in turn, led Iran to fire missiles at a base in Iraq hosting US forces, leaving more than 100 troops with brain injuries.

US Secretary of State Mike Pompeo has argued the killing of Soleimani was necessary in part to deter Iran and Iran-backed groups from additional attacks.

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The US-led military coalition in Iraq said in a statement that 18 107 mm Katyusha rockets struck the base and suggested they may have been fired from a truck.

It confirmed three personnel were killed and about a dozen wounded but declined to disclose the nationalities of the casualties or offer any other identifying information.

“The attack is under investigation by the Coalition and Iraqi Security Forces,” the coalition said.

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Earlier yesterday, the Iraqi military said no casualties had been reported in the attack.

War powers vote

In a sign of concern that tensions between the United States and Iran could be headed toward open conflict, the Democratic-led US House of Representatives passed legislation yesterday to limit President Donald Trump's ability to wage war against Iran.

The Republican president has been engaged in a maximum-pressure campaign of renewed sanctions and near-constant rhetorical conflict against Iran, after pulling the United States out of the international nuclear deal reached during the administration of his Democratic predecessor, Barack Obama.

Tension between Washington and Tehran have mostly played out on Iraqi soil in recent months.

Iran-backed paramilitary groups have regularly been rocketing and shelling bases in Iraq that host US forces and the area around the US Embassy in Baghdad.

The Kataib Hezbollah militia was blamed for an attack on a base last year that killed an American contractor, which led to retaliatory US strikes against it in Iraq and Syria.

Syrian state media reported yesterday that unidentified jets hit targets south-east of a Syrian town along the border with Iraq.

But there was no indication so far that those strikes were by the United States. US officials told Reuters the United States had not carried out any retaliatory strikes at this point. — Reuters