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KILIS, TURKEY - JULY 25: Turkish tanks patrol close to the village of Elbeyli, near the border with Syria in southeastern Turkey on July 25, 2015, as the Turkey raises its security measures along the borderline with Syria after the gunfire from Syria killing a Turkish officer on July 23. (Photo by Fatih Aktas/Anadolu Agency/Getty Images)

KILIS, TURKEY - JULY 25: Turkish tanks patrol close to the village of Elbeyli, near the border with Syria in southeastern Turkey on July 25, 2015, as the Turkey raises its security measures along the borderline with Syria after the gunfire from Syria killing a Turkish officer on July 23. (Photo by Fatih Aktas/Anadolu Agency/Getty Images)