Two Turkish F-16 warplanes struck six Islamic State targets and a position of the US-backed Kurdish YPG militia in Syria on Saturday, Turkish security sources said. The sources did not give further details. Earlier on Saturday, a group allied to the Kurdish-backed Syrian Democratic Forces (SDF), an alliance which includes the Kurdish YPG militia, said its positions were bombarded by Turkish warplanes near Jarablus, a frontier town in northern Syria.