U.S.-backed Syrian Democratic Forces (SDF) commander Adnan Afrin, poses for a photo in the in Omar oil field base, Syria, Friday, Feb. 15, 2019. Adnan Afrin told The Associated Press that in the last three days, the Islamic State group has brought up from underground tunnels hundreds of civilians, to let them be known to the SDF and the U.S.-led coalition. He says the discovery has blunted the offensive. 