DAMASCUS - Rocket fire targeted the largest US base in eastern Syria on Sunday, the latest in a string of hits targeting the facility recently, according to the state news agency SANA.

The shelling targeted the US base located in the al-Omar oil field in the eastern countryside of Deir al-Zour, sending smoke spiraling up in the sky, according to SANA.

The base has been targeted repeatedly by pro-Iran militias in the region.

On July 7, the same facility was targeted by weapon-laden drones.

Meanwhile, the Syrian Observatory for Human Rights said the attack on Sunday is believed to have been carried out by the pro-Iran militia in the western Euphrates River region in Deir al-Zour.

The UK-based watchdog group said there is no report on human losses yet.

A day earlier, an explosion targeted the Koniko gas factory where another US base is located in the eastern countryside of Deir al-Zour with no reports on losses, according to the observatory.