Video shows policeman confronting attacker at Istanbul airport

A video has emerged online showing the moment one of the three suicide bombers who targeted Istanbul's Ataturk airport was shot before detonating the explosives. 
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A CCTV camera clip leaked to the Turkish media and social media shows the suspect running through a terminal while other people are fleeing. He stops and falls to the ground, dropping an object. A second man, presumably a policeman, approaches the fallen