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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)

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)

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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)

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)

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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)

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)

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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)

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)

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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)

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)