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Ambulances arrive 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. 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)

Ambulances arrive 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. 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)
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