The Islamic State in Iraq and Syria (ISIS) on Sunday pushed back an advance by U.S.-backed forces in northern Syria, according to media reports, taking back territory it had lost to coalition forces.

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ISIS fighters reportedly infiltrated villages and mountains that were seized last month by the Syrian Democratic Forces — a group aided by U.S. special forces that includes Kurdish and Arab fighters — near the town of Manbij.

Manjib, a town held by the Islamic State, had been circled by the Syrian Democratic Forces for weeks and clashes had been taking place, according to the Associated Press.

ISIS said a fighter was driving a car with explosives and struck a group of Kurds in Manbij.

The Syrian Observatory for Human Rights said there were clashes and U.S.-led airstrikes. It said a series of explosions took place due to suicide operations by the Islamic State.

The Syrian Arab Red Crescent reported its convoy had come under fire when it was returning from delivering humanitarian aide to a suburb of the Syrian capital. It said one of its staffers was "hit" and one of the cars in the convoy was shot at.