Damascus, July 12 : Rocket fire targeted the largest US base in eastern Syria, marking the latest in a string of recent attacks targeting the facility, according to the state news agency SANA. The shelling on Sunday targeted the base located in the al-Omar oil field in the eastern countryside of Deir al-Zour, Xinhua news agency quoted SANA as saying. The base has been targeted repeatedly by pro-Iran militias in the region. On July 7, the same facility was targeted by explosives-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 casualties 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. /IANS