Forensic officers work at the site where a car bomb exploded near the stadium of football club Besiktas in central Istanbul on December 10, 2016. Twenty-nine people, mainly police, were killed and 166 wounded in Istanbul on Saturday when twin bombings struck the heart of the city close to the stadium of top flight football giants Besiktas after a major game. / AFP / Ozan KOSE (Photo credit should read OZAN KOSE/AFP via Getty Images)
Getty Images

AFP OZAN KOSE

Turkish emergency workers and police officers are seen on the site where a car bomb exploded near the stadium of football club Besiktas in central Istanbul on December 10, 2016. The car bomb exploded in the heart of Istanbul on late December 10, wounding around 20 police officers, Turkey's interior minister said, quoted by the official Anadolu news agency. The bomb, apparently targeting a bus carrying police officers, exploded outside the stadium of Istanbul football club Besiktas following its match against Bursaspor. (Photo by Emrah Oprukcu/NurPhoto via Getty Images)
Getty Images

NurPhoto NurPhoto

20 police officers were wounded in live bomb action in Istanbul, Turkey, on 10 December 2016. 2 bombs exploded against the police working next to Besiktas stadium. A large number of ambulances were sent to the scene. The crime scene was closed by the police. (Photo by Erhan Demirtas/NurPhoto via Getty Images)
Getty Images

NurPhoto NurPhoto

Turkish emergency workers and police officers are seen on the site where a car bomb exploded near the stadium of football club Besiktas in central Istanbul on December 10, 2016. The car bomb exploded in the heart of Istanbul on late December 10, wounding around 20 police officers, Turkey's interior minister said, quoted by the official Anadolu news agency. The bomb, apparently targeting a bus carrying police officers, exploded outside the stadium of Istanbul football club Besiktas following its match against Bursaspor. (Photo by Emrah Oprukcu/NurPhoto via Getty Images)
Getty Images

NurPhoto NurPhoto

Turkish emergency workers and police officers are seen on the site where a car bomb exploded near the stadium of football club Besiktas in central Istanbul on December 10, 2016. The car bomb exploded in the heart of Istanbul on late December 10, wounding around 20 police officers, Turkey's interior minister said, quoted by the official Anadolu news agency. The bomb, apparently targeting a bus carrying police officers, exploded outside the stadium of Istanbul football club Besiktas following its match against Bursaspor. (Photo by Emrah Oprukcu/NurPhoto via Getty Images)
Getty Images

NurPhoto NurPhoto