ISTANBUL, TURKEY - JANUARY 12: A wounded man is seen on the ground at the Sultanahmet tourist district after an explosion in Istanbul, Turkey on January 12, 2016. Turkish police have sealed off central Istanbul square in historic Sultanahmet district after the explosion was heard. Ambulances raced to the scene in the minutes after the explosion. (Photo by Arif Hudaverdi Yaman/Anadolu Agency/Getty Images)
