Syrian and foreign Islamic State group fighters are to evacuate their one-time bastion Raqa as part of an agreement brokered by tribal leaders, a senior local official told AFP Saturday.

Omar Alloush, a top official of the Raqa Civil Council, said a deal had been reached to allow fighters out of the city, which is on the verge of being captured by the US-backed Syrian Democratic Forces.

"Foreign fighters are included in the deal," he said