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ISTANBUL, TURKEY - MARCH 19: Turkish Police officers block the Istiklal street as they take security measures after an explosion at Istiklal street in Istanbul, Turkey on March 19, 2016. (Photo by Mohammed Elshamy/Anadolu Agency/Getty Images)

ISTANBUL, TURKEY - MARCH 19: Turkish Police officers block the Istiklal street as they take security measures after an explosion at Istiklal street in Istanbul, Turkey on March 19, 2016. (Photo by Mohammed Elshamy/Anadolu Agency/Getty Images)