A volley of missiles appeared to target the US’s embassy and one of its bases in Iraq on Saturday night, sparking fears an Iran-backed militia had begun taking revenge for the killing of its commander and Iran’s top general.

A Katusya rocket struck inside the Green Zone close to the American mission in Baghdad, followed minutes later by a two rockets 40 miles away on al-Balad airbase, which houses US Air Force trainers.

Three Iraqi military personnel were reported to have been injured in the second assault.

Katib Hizbollah militia, which operates under the PMF, issued a call last night for Iraqi security forces to "move away from American bases by a distance of no less than 1km," starting from Sunday evening, suggesting the attacks would continue.

While such attacks, which have in the past been claimed by the Population Mobilisation Forces (PMF), on US installations in Iraq are not unusual, the timing and targets appeared to suggest a coordinated response.