"New stikes hit the Jurf al-Nasr base," a source from the Hashed al-Shaabi, a former paramilitary group now integrated into the regular army, told AFP.

The Iraqi government's security media cell announced that "at 7:25 pm (1625 GMT), the Jurf al-Nasr area... was targeted by two air strikes."

A Kataeb Hezbollah official confirmed a new attack had occurred.

Two fighters from Kataeb Hezbollah were killed on Saturday morning in air strikes on the base in southern Iraq, which belongs to the Hashed al-Shaabi or the Popular Mobilisation Forces.

Kataeb Hezbollah warned then in a statement "we will soon begin attacking American bases in response to their aggression".

Soon after, Kurdish security forces said US-led coalition forces downed several missiles and explosive-laden drones over the city of Erbil, the capital of Iraq's autonomous Kurdistan region.

Explosions were heard again in Erbil in the evening, with an AFP journalist reporting seeing a drone exploding over the city.