Have they crossed the line? Ankara is shelling U.S.-backed Kurds fighting against ISIS in northern Syria. International pressure is mounting for Turkey to halt its attacks, which were prompted by concerns over the Kurdish militia’s territorial gains near the border. Turkish Prime Minister Ahmet Davutoglu says his troops were provoked and responded appropriately, “and will continue to do so.” Turkey is also denying reports that around 100 of its soldiers have entered Syria. Meanwhile, Damascus is calling on the U.N. to take action against Turkey for shelling its northern region.