(reuters) -- The U.S.-backed Syrian Democratic Forces (SDF), an alliance of Kurdish and Arab militias, continued to battle Isis militants who remain in the city, SDF spokesman Mostafa Bali said. Foreign fighters did not leave under the withdrawal deal, he added.

"The operations has finished and the battle continues," Bali said. "Last night, the final batch of fighters (who agreed to leave) left the city."

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