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Open Image ModalSmoke rises from a burning bus after military vehicles hit by Ankara blast close to government, at Merasim street on the intersection of Inonu Boulevard and Dikmen avenue in Turkey's capital Ankara on February 17, 2016. (credit:Anadolu Agency via Getty Images)
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Open Image ModalAn injured person receives medical treatment by rescue workers following an explosion after an attack targeted a convoy of military service vehicles in Ankara on February 17, 2016. (credit:ADEM ALTAN via Getty Images)
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Open Image ModalA firefighter tries to put out a fire as Turkish army busses burn after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Erhan Ortac via Getty Images)
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Open Image ModalA firefighter tries to put out a fire as Turkish army busses burn after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Erhan Ortac via Getty Images)
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Open Image ModalA man reacts next to policemen near the site of an explosion after an attack targeted a convoy of military service vehicles in Ankara on February 17, 2016. (credit:AFP via Getty Images)
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Open Image ModalSmokes rises above buildings following an explosion after an attack targeted a convoy of military service vehicles in Ankara on February 17, 2016. (credit:STRINGER via Getty Images)
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Open Image ModalA police officer gestures as he walks at the site of an explosion while firefighters try to extinguish flames after an attack targeted a convoy of military service vehicles in Ankara on February 17, 2016. (credit:STRINGER via Getty Images)
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Open Image ModalTurkish police secure the blast site after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalTurkish army service busses burn after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalAmbulances pass the blast site after an explosion hit the Turkish army's service busses in Ankara, February 17, 2016 Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalSmoke billows from the blast site as Turkish army service busses burn after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalTurkish army service busses burn after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalTurkish army service busses burn after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalTurkish army service busses burn after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalA wounded man is carried to an ambulance after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalEmergency workers help an injured person on the ground near the site of an explosion after an attack targeted a convoy of military service vehicles in Ankara on February 17, 2016. (credit:CIHAN via Getty Images)
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Open Image ModalTurkish army service busses burn after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalA wounded man is carried to an ambulance after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalPeople carry a wounded man as Turkish army service busses burn after an explosion on February 17, 2016 in Ankara, Turkey. (credit:Defne Karadeniz via Getty Images)
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Open Image ModalFirefighters work at a scene of fire from an explosion in Ankara, Wednesday, Feb. 17, 2016. (credit:ASSOCIATED PRESS)
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Open Image ModalPeople react at the scene of an explosion in Ankara, Wednesday, Feb. 17, 2016. (credit:ASSOCIATED PRESS)
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Open Image ModalFirefighters work at a scene of fire from an explosion in Ankara, Wednesday, Feb. 17, 2016. (credit:ASSOCIATED PRESS)
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Open Image ModalSmoke from a fire billow is seen following an explosion as police officers secure the area in Ankara, Wednesday, Feb. 17, 2016. (credit:ASSOCIATED PRESS)
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Open Image ModalFirefighters work on a fire as police secure the area of an explosion in Ankara, Wednesday, Feb. 17, 2016, after assailants exploded a car bomb near vehicles carrying military personnel in the Turkish capital, killing several people and injuring scores of others, officials said. The explosion occurred during evening rush hour in the heart of city, in an area close to where military headquarters and the parliament are located. (Mustafa Kirazli/Cihan News Agency via AP) TURKEY OUT (credit:ASSOCIATED PRESS)
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Open Image ModalA police officer clears the area of an explosion in Ankara, Wednesday, Feb. 17, 2016, after assailants exploded a car bomb near vehicles carrying military personnel in the Turkish capital. (credit:ASSOCIATED PRESS)
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Open Image ModalSmoke rises from a burning bus after an explosion at Merasim street on the intersection of Inonu Boulevard and Dikmen avenue in Turkey's capital Ankara on February 17, 2016. (credit:Anadolu Agency via Getty Images)
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Open Image ModalSmoke rises from a burning bus after military vehicles hit by Ankara blast close to government, at Merasim street on the intersection of Inonu Boulevard and Dikmen avenue in Turkey's capital Ankara on February 17, 2016. (credit:Anadolu Agency via Getty Images)
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Open Image ModalSmoke rises from a burning bus after military vehicles hit by Ankara blast close to government, at Merasim street on the intersection of Inonu Boulevard and Dikmen avenue in Turkey's capital Ankara on February 17, 2016. (credit:Anadolu Agency via Getty Images)
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Open Image ModalInjured people are taken to hospital after military vehicles hit by Ankara blast close to government, at Merasim street on the intersection of Inonu Boulevard and Dikmen avenue in Turkey's capital Ankara on February 17, 2016. (credit:Anadolu Agency via Getty Images)
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Open Image ModalFirefighters try to extinguish flames following an explosion after an attack targeted a convoy of military service vehicles in Ankara on February 17, 2016. (credit:STRINGER via Getty Images)
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Open Image ModalFirefighters try to extinguish flames following an explosion after an attack targeted a convoy of military service vehicles in Ankara on February 17, 2016. (credit:STRINGER via Getty Images)
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Open Image ModalFlames are seen following an explosion after an attack targeted a convoy of military service vehicles in Ankara on February 17, 2016. (credit:STRINGER via Getty Images)
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Open Image ModalA fire engine stands at the site of an explosion after an attack targeted a convoy of military service vehicles in Ankara on February 17, 2016. (credit:STRINGER via Getty Images)
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Open Image ModalFirefighters work at a scene of fire from an explosion in Ankara, Wednesday, Feb. 17, 2016. (credit:ASSOCIATED PRESS)