TURKEY-UNREST-EXPLOSION-BLAST-METRO(01 of17)
Open Image ModalA metro passes as forensic officers work at the site of an explosion on December 1 , 2015 at Bayrampasa district in Istanbul.\nA station on the Istanbul metro was on December 1 rocked by a blast suspected to have been caused by a home-made bomb, causing panic in the evening rush hour and wounding up to half a dozen people. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images) (credit:OZAN KOSE via Getty Images)
Explosion near Istanbul metro station(02 of17)
Open Image ModalISTANBUL, TURKEY - DECEMBER 1 : Turkish crime scene investigation team inspect the blast site around Bayrampasa Metro Station after a blast occurred at an intersection in Bayrampasa district on the European in Istanbul, Turkey on December 1, 2015. (Photo by Isa Terli/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Turkey Explosion(03 of17)
Open Image ModalPolice forensic officers investigate after an explosion on a highway overpass near a subway station wounded five people and was caused by a bomb, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The bomb was left on barriers on the overpass, said Atilla Aydiner, the mayor for Istanbul\'s Bayrampasa district.(AP Photo/Can Erok) (credit:ASSOCIATED PRESS)
Turkey Explosion(04 of17)
Open Image ModalPolice forensic officers investigate after an explosion on a highway overpass near a subway station wounded five people and was caused by a bomb, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The bomb was left on barriers on the overpass, said Atilla Aydiner, the mayor for Istanbul\'s Bayrampasa district.(AP Photo/Can Erok) (credit:ASSOCIATED PRESS)
TURKEY-UNREST-EXPLOSION-BLAST-METRO(05 of17)
Open Image ModalForensic officers work at the site of an explosion on December 1 , 2015 at Bayrampasa district in Istanbul.\nA station on the Istanbul metro was on December 1 rocked by a blast suspected to have been caused by a home-made bomb, causing panic in the evening rush hour and wounding up to half a dozen people.\n / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images) (credit:OZAN KOSE via Getty Images)
Turkey Explosion(06 of17)
Open Image ModalRiot police secure the area after an explosion on a highway overpass near a subway station, wounding five people, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The explosion was caused by a bomb left on barriers on the overpass, according to Atilla Aydiner, the mayor for Istanbul\'s Bayrampasa district.(AP Photo/Cagdas Erdogan) (credit:ASSOCIATED PRESS)
Explosion near Istanbul metro station(07 of17)
Open Image ModalISTANBUL, TURKEY - DECEMBER 1 : People wait outside the Bayrampasa Metro Station after a blast occurred at an intersection in Bayrampasa district on the European in Istanbul, Turkey on December 1, 2015. (Photo by Isa Terli/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Explosion near Istanbul metro station(08 of17)
Open Image ModalISTANBUL, TURKEY - DECEMBER 1 : People wait outside the Bayrampasa Metro Station after a blast occurred at an intersection in Bayrampasa district on the European in Istanbul, Turkey on December 1, 2015. (Photo by Isa Terli/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
Turkey Explosion(09 of17)
Open Image ModalRiot police secure the area after an explosion on a highway overpass near a subway station, wounding five people, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The explosion was caused by a bomb left on barriers on the overpass, according to Atilla Aydiner, the mayor for Istanbul\'s Bayrampasa district.(AP Photo/Cagdas Erdogan) (credit:ASSOCIATED PRESS)
Turkey Explosion(10 of17)
Open Image ModalRiot police arrive after an explosion on a highway overpass near a subway station, wounded five people and was caused by a bomb according to information given by the local mayor, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The bomb was left on barriers on the overpass, said Atilla Aydiner, the mayor for Istanbul\'s Bayrampasa district.(AP Photo/Cagdas Erdogan) (credit:ASSOCIATED PRESS)
Turkey Explosion(11 of17)
Open Image ModalRiot police arrive after an explosion on a highway overpass near a subway station, wounded five people and was caused by a bomb according to information given by the local mayor, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The bomb was left on barriers on the overpass, said Atilla Aydiner, the mayor for Istanbul\'s Bayrampasa district. (AP Photo/Cagdas Erdogan) (credit:ASSOCIATED PRESS)
TURKEY-UNREST-EXPLOSION-BLAST-METRO(12 of17)
Open Image ModalForensic officers work at the site of an explosion on December 1, 2015 at Bayrampasa district in Istanbul.\nA station on the Istanbul metro was on December 1 rocked by a blast suspected to have been caused by a home-made bomb, causing panic in the evening rush hour and wounding up to half a dozen people. / AFP / CAGDAS ERDOGAN (Photo credit should read CAGDAS ERDOGAN/AFP/Getty Images) (credit:CAGDAS ERDOGAN via Getty Images)
Turkey Explosion(13 of17)
Open Image ModalA police forensic officer secures the area after an explosion on a nearby highway overpass near a subway station wounded five people and was caused by a bomb, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The bomb was left on barriers on the overpass, said Atilla Aydiner, the mayor for Istanbul\'s Bayrampasa district.(AP Photo/Cagdas Erdogan) (credit:ASSOCIATED PRESS)
Explosion near Istanbul metro station(14 of17)
Open Image ModalISTANBUL, TURKEY - DECEMBER 1 : Turkish crime scene investigation team inspect the blast site around Bayrampasa Metro Station after a blast occurred at an intersection in Bayrampasa district on the European in Istanbul, Turkey on December 1, 2015. (Photo by Isa Terli/Anadolu Agency/Getty Images) (credit:Anadolu Agency via Getty Images)
TURKEY-UNREST-EXPLOSION-BLAST-METRO(15 of17)
Open Image ModalTurkish riot policemen stand guard near the site of an explosion on December 1, 2015 at Bayrampasa district in Istanbul.\nA station on the Istanbul metro was on December 1 rocked by a blast suspected to have been caused by a home-made bomb, causing panic in the evening rush hour and wounding up to half a dozen people. / AFP / CAGDAS ERDOGAN (Photo credit should read CAGDAS ERDOGAN/AFP/Getty Images) (credit:CAGDAS ERDOGAN via Getty Images)
TURKEY-UNREST-EXPLOSION-BLAST-METRO(16 of17)
Open Image ModalTurkish riot policemen guard near the site of an explosion on December 1, 2015 at Bayrampasa district in Istanbul.\nA station on the Istanbul metro was on December 1 rocked by a blast suspected to have been caused by a home-made bomb, causing panic in the evening rush hour and wounding up to half a dozen people. / AFP / CAGDAS ERDOGAN (Photo credit should read CAGDAS ERDOGAN/AFP/Getty Images) (credit:CAGDAS ERDOGAN via Getty Images)
TURKEY-UNREST-EXPLOSION-BLAST-METRO(17 of17)
Open Image ModalTurkish riot policemen guard the site of an explosion on December 1, 2015 at Bayrampasa district in Istanbul.\nA station on the Istanbul metro was on December 1 rocked by a blast suspected to have been caused by a home-made bomb, causing panic in the evening rush hour and wounding up to half a dozen people. / AFP / CAGDAS ERDOGAN (Photo credit should read CAGDAS ERDOGAN/AFP/Getty Images) (credit:CAGDAS ERDOGAN via Getty Images)