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A Turkish man stands as a Turkish tank convoy drives to Syria from the Turkish Syrian border city of Karkamis in the southern region of Gaziantep, on August 26, 2016. Turkey shelled Kurdish militia fighters in Syria on August 26 on the second day of a major military operation inside the country, saying they were failing to observe a deal with the US to stop advancing in jihadist-held territory. Turkey's army backed by international coalition air strikes launched an operation involving fighter jets and elite ground troops to drive Islamic State jihadists out of the border area. / AFP / BULENT KILIC (Photo credit should read BULENT KILIC/AFP/Getty Images)

A Turkish man stands as a Turkish tank convoy drives to Syria from the Turkish Syrian border city of Karkamis in the southern region of Gaziantep, on August 26, 2016. 
Turkey shelled Kurdish militia fighters in Syria on August 26 on the second day of a major military operation inside the country, saying they were failing to observe a deal with the US to stop advancing in jihadist-held territory. Turkey's army backed by international coalition air strikes launched an operation involving fighter jets and elite ground troops to drive Islamic State jihadists out of the border area. / AFP / BULENT KILIC        (Photo credit should read BULENT KILIC/AFP/Getty Images)