ISTANBUL, TURKEY - DECEMBER 10: (EDITOR'S NOTE: Image contains graphic content) Forensic policemen and officers attend the scene following a twin suicide bomb attack near to Besiktas Vodaphone Arena on December 10, 2016 in Istanbul, Turkey. According to reports, at least 13 people were killed by a twin suicide bomb attack near to the Besiktas Vodaphone Arena, which is believed to have been targeting riot police. (Photo by Kurtulus Ari /Getty Images)
ISTANBUL, TURKEY - DECEMBER 10: (EDITOR'S NOTE: Image contains graphic content) Forensic policemen and officers attend the scene following a twin suicide bomb attack near to Besiktas Vodaphone Arena on December 10, 2016 in Istanbul, Turkey. According to reports, at least 13 people were killed by a twin suicide bomb attack near to the Besiktas Vodaphone Arena, which is believed to have been targeting riot police. (Photo by Kurtulus Ari /Getty Images)
ISTANBUL, TURKEY - DECEMBER 10: (EDITOR'S NOTE: Image contains graphic content) Forensic policemen and officers attend the scene following a twin suicide bomb attack near to Besiktas Vodaphone Arena on December 10, 2016 in Istanbul, Turkey. According to reports, at least 13 people were killed by a twin suicide bomb attack near to the Besiktas Vodaphone Arena, which is believed to have been targeting riot police. (Photo by Kurtulus Ari /Getty Images)
Forensic policemen and officers attend the scene following a twin suicide bomb attack near to Besiktas Vodaphone Arena on December 10, 2016 in Istanbul, Turkey. According to reports, at least 13 people were killed by a twin suicide bomb attack near to the Besiktas Vodaphone Arena, which is believed to have been targeting riot police. (Photo by Erhan Demirtas/NurPhoto via Getty Images)
A group of policemen at the scene after explosions near the Besiktas Vodaphone Arena on December 10, 2016 in Istanbul, Turkey. According to reports, at least 13 people were killed after explosions believed to have been targeting riot police were set off near to the Besiktas Vodaphone Arena. (Photo by Erhan Demirtas/NurPhoto via Getty Images)
