Turkey on Thursday threatened to strike Syrian Kurdish militia forces if they don't withdraw from Manbij, a former bastion of Islamic State extremists that has been taken over by predominantly-Kurdish forces.
"We will strike the YPG if they do not retreat," Foreign Minister Mevlut Cavusoglu told journalists, referring to the Kurdish People's Protection Units.
The YPG, which Ankara considers a "terrorist" organisation, is backed by Washington as the most effective fighting force on the ground in the battle against ISIS. Turkey launched a military campaign inside Syria in August, backing opposition rebels who captured a number of towns from ISIS jehadists, including Al Bab near the Turkish border.