Turkish President Abdullah Gul met here yesterday the visiting Secretary-General of the United Nations Ban Ki-moon. During the meeting, they discussed several current issues, especially the Syrian issue, and the problem of Syrian refugees, according to a report of the Turkish news agency "Anadolu." The Secretary-General also met with Turkish Prime Minister Recep Tayyip Erdogan, and discussed with him the Syrian crisis and its dimensions, and ways to overcome them to stop "the killing machine and sabotage" in Syria.