David L. Phillips in Huffington Post:
Is Turkey collaborating with the Islamic State (ISIS)? Allegations range from military cooperation and weapons transfers to logistical support, financial assistance, and the provision of medical services. It is also alleged that Turkey turned a blind eye to ISIS attacks against Kobani.
President Recep Tayyip Erdogan and Prime Minister Ahmet Davutoglu strongly deny complicity with ISIS. Erdogan visited the Council on Foreign Relations on September 22, 2014. He criticized “smear campaigns [and] attempts to distort perception about us.” Erdogan decried, “A systematic attack on Turkey's international reputation, “complaining that “Turkey has been subject to very unjust and ill-intentioned news items from media organizations.” Erdogan posited: “My request from our friends in the United States is to make your assessment about Turkey by basing your information on objective sources.”
Columbia University's Program on Peace-building and Rights assigned a team of researchers in the United States, Europe, and Turkey to examine Turkish and international media, assessing the credibility of allegations. This report draws on a variety of international sources — The New York Times, The Washington Post, The Guardian, The Daily Mail, BBC, Sky News, as well as Turkish sources, CNN Turk, Hurriyet Daily News, Taraf, Cumhuriyet, and Radikal among others.
Allegations
Turkey Provides Military Equipment to ISIS
• An ISIS commander told The Washington Post on August 12, 2014: “Most of the fighters who joined us in the beginning of the war came via Turkey, and so did our equipment and supplies.”
• Kemal Kiliçdaroglu, head of the Republican People's Party (CHP), produced a statement from the Adana Office of the Prosecutor on October 14, 2014 maintaining that Turkey supplied weapons to terror groups. He also produced interview transcripts from truck drivers who delivered weapons to the groups. According to Kiliçdaroglu, the Turkish government claims the trucks were for humanitarian aid to the Turkmen, but the Turkmen said no humanitarian aid was delivered.
• According to CHP Vice President Bulent Tezcan, three trucks were stopped in Adana for inspection on January 19, 2014. The trucks were loaded with weapons in Esenboga Airport in Ankara. The drivers drove the trucks to the border, where a MIT agent was supposed to take over and drive the trucks to Syria to deliver materials to ISIS and groups in Syria. This happened many times. When the trucks were stopped, MIT agents tried to keep the inspectors from looking inside the crates. The inspectors found rockets, arms, and ammunitions.