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The United States on Tuesday carried out a strike in Iraq in self-defence, US officials told Reuters, as regional tensions rose after an Israeli airstrike in Beirut that Israel claims killed Hezbollah's most senior commander.

Iraqi police and medical sources said the strike inside a base south of Baghdad used by Iraq's Popular Mobilisation Forces (PMF) killed four members of the group, which contains several Iran-aligned armed militias, and wounded four others.

In a statement after the blasts, the Popular Mobilisation Forces did not accuse who was responsible.

US officials, speaking on condition of anonymity, said the United States carried out an airstrike in Musayib, located in Babil province, but did not provide more details on the location.

The officials added that the strike targeted militants that the US deemed were looking to launch drones and posed to US and coalition forces.

The officials did not comment on any casualties.

"This action underscores the United States' commitment to the safety and security of our personnel," one of the officials said.

Multiple rockets were launched toward Iraq's Ain al-Asad airbase housing US-led forces last week, US and Iraqi sources said, with no damage or casualties reported. US officials said none of the rockets hit the base.

Tuesday's action was the first known US strike in Iraq since February, when the US military launched airstrikes in Iraq and Syria against more than 85 targets linked to Iran's Revolutionary Guard and Iran-aligned militias.

The 150,000-strong Popular Mobilisation Forces, a state-sanctioned grouping of Iraqi paramilitaries, is dominated by heavily armed and battle-hardened groups loyal to Iran and with close ties to its Revolutionary Guards.

Iraq, a rare ally of both the US and Iran, which hosts 2,500 US troops and has Iran-backed militias linked to its security forces, has witnessed escalating tit-for-tat attacks since Israel's war on Gaza on 7 October.

Iraq wants troops from the US-led military coalition to begin withdrawing in September and to end the coalition's work by September 2025 formally, Iraqi sources have said, with some US forces likely to remain in a newly negotiated advisory capacity.

The issue is highly politicised, with mainly Iran-aligned Iraqi political factions looking to show that they are again pushing out the country's one-time occupier, while US officials want to avoid giving Iran and its allies a win.

US-led forces invaded Iraq in 2003, toppled former leader Saddam Hussein and then withdrew in 2011, only to return in 2014 to fight Islamic State at the head of a coalition.

(Reuters)