"A joint base north of Hasakeh used for planning and executing joint operations against the Islamic State group has been hit by a Turkish drone," a spokesman for the Kurdish-led Syrian Democratic Forces, Farhad Shami, told AFP, adding that two SDF fighters had been killed.

A Britain-based monitoring group, the Syrian Observatory for Human Rights, confirmed the joint base had come under attack but was not immediately in a position to say whether coalition forces had been present at the time.