Rebel groups broke through an Islamic State siege around an opposition-held town in northwestern Syria on Wednesday, reopening their main road to the Turkish border, the Syrian Observatory for Human Rights said.
The rebel groups besieged in the town of Marea had launched a counter attack against Islamic State after issuing a statement saying they had united ranks. The stranded rebels were air dropped weapons last week by the U.S.-led coalition against Islamic State, rebel sources said at the time.
The fighting had trapped thousands of civilians in Marea.
The rebels had broken the siege by capturing the village of Kafr Kalbin on the road linking Marea with Azaz, 20 km (12 miles) to the northwest, said the Observatory which monitors the conflict.
Rebels fighting Islamic State north of Aleppo have received military assistance from states opposed to President Bashar al-Assad.
Their battle with Islamic State is separate to one being waged further east by the U.S.-backed Syria Democratic Forces, which includes the Kurdish YPG militia.