see more

A picture taken on March 2, 2017 shows cell-doors in a hallway in an Islamic State (IS) group prison in the northern Syrian town of al-Bab, after Turkish-backed rebels announced the recapture of the town from IS. / AFP PHOTO / Nazeer al-Khatib (Photo credit should read NAZEER AL-KHATIB/AFP/Getty Images)

A picture taken on March 2, 2017 shows cell-doors in a hallway in an Islamic State (IS) group prison in the northern Syrian town of al-Bab, after Turkish-backed rebels announced the recapture of the town from IS. / AFP PHOTO / Nazeer al-Khatib        (Photo credit should read NAZEER AL-KHATIB/AFP/Getty Images)