A car bomb in northeast Syria targeting a checkpoint manned by Turkish-backed forces killed six people, mostly fighters, near the border town of Ras al-Ain Thursday, the Britain-based Syrian Observatory for Human Rights said.
The blast in the village of Tal Halaf held by Turkish forces and their Syrian proxies also wounded 15 others, it said.
Turkish forces and their Syrian proxies last year seized a 120-kilometer stretch of land inside the Syrian border from Kurdish forces, running from Ras al-Ain to Tal Abyad.
Many bombings have since rocked the area, several in the past week alone.
An explosives-rigged motorbike in Ras al-Ain Tuesday killed two civilians and a fighter, the Observatory said, two days after another in a vegetable market in the town killed eight people, six of them civilians.
The Kurdish-led People's Protection Units, from whom the Turks and their allies seized the territory, have played a key role in the US-backed fight against ISIS in Syria.
But Ankara views them as an extension of the Kurdistan Workers' Party (PKK).
