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ISIS flagReuters

A car bombing carried out by the Islamic State (ISIS) group killed dozens of displaced people in the eastern Syrian province of Deir Ezzor on Saturday, AFP reported, citing the Syrian Observatory for Human Rights.

The Britain-based organization said the attack targeted people displaced by fighting in the oil-rich province who had gathered on the eastern bank of the Euphrates River. Dozens more were wounded, it added.

The attack comes as Syrian and allied forces converged Saturday on holdout ISIS fighters in the border town of Albu Kamal, a day after Russian-backed regime forces took full control of the provincial capital, also called Deir Ezzor, which was the last Syrian city where ISIS still had a presence.

"The Islamic State group targeted with a car bomb displaced people on the eastern bank of the Euphrates River, killing dozens and wounding dozens of others," Observatory head Rami Abdel Rahman said, according to AFP.

He added that he could not immediately gave a specific toll of how many people were killed and wounded in the attack.

Abdel Rahman said the victims had fled battlegrounds in Deir Ezzor province, where the U.S.-backed Kurdish-Arab Syrian Democratic Forces (SDF) alliance is also on the offensive against ISIS.

The SDF is attacking ISIS on the eastern bank of the Euphrates which cuts across the province, while Russian-backed Syrian forces are battling the jihadists on the western bank of the river.

The parallel offensives have sent thousands of civilians fleeing for their lives, some straight into the desert.

Despite being driven out from large parts of Deir Ezzor, ISIS still controls 37 percent of the province and its fighters are deployed in the eastern side.