EDITORS NOTE: Graphic content / A picture taken on December 19, 2016 shows Mevlut Mert Altintas, the gunman who killed Russia's Ambassador to Turkey, during an attack during a public event in Ankara.
A gunman crying "Aleppo" and "revenge" shot Karlov while he was visiting an art exhibition in Ankara on December 19, witnesses and media reports said. The Turkish state-run Anadolu news agency said the gunman had been "neutralised" in a police operation, without giving further details.  / AFP / Sozcu daily / Yavuz Alatan / Turkey OUT        (Photo credit should read YAVUZ ALATAN/AFP/Getty Images)