Iraqi Shiite fighters from the Popular Mobilization units hold an Iraqi flag in the city of Baiji, north of Tikrit, in the Salahaddin province, on June 7, 2015. Iraqi forces advanced against the Islamic State (IS) jihadist group in Baiji as they battled to retake the strategic town for a second time. AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
