Turkey-backed Syrian rebels entered the northern Syrian city of Manbij after taking control of most of the surrounding area from US-allied Kurdish forces there, a Turkish security source said on Sunday.
Syrian rebels in the south declared President Bashar al-Assad's ouster on Sunday after seizing control of Damascus. The Turkey-backed rebels in the north are aligned with the rebels in the south, sharing the same goal of defeating Assad.
"The fight against the YPG/PKK is very close to victory. Both air and land interventions are ongoing to take Manbij from the hands of the YPG/PKK," the source said, referring to the Kurdish militia, which has long been in control of Manbij.
Turkish attacks on Manbij
The source said the Turkish-backed forces controlled 80% of the Manbij region, an area covering some several hundred square kilometers, and had entered the city itself.
However, the US-backed Syrian Kurdish forces, who control northeast Syria and have been the target of several Turkish incursions in the past, said they were still fighting the Turkish-backed rebels in the city.
Manbij city is some 30 km (19 miles) south of the Turkish border and to the west of the Euphrates River.
The Turkey-backed Syrian rebels earlier said they had started an attack on Manbij.
The YPG has been a central element of US-allied forces in a coalition against Islamic State militants. Turkey says the YPG is a terrorist group, closely tied to Kurdistan Workers Party (PKK) militants who have fought the Turkish state for 40 years.