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Shiite fighters from the Popular Mobilization Forces arrive in an area south of Mosul, on October 22, 2016, during an operation to retake the main hub city from the Islamic State (IS) group jihadists. Mosul is the most populous city in the 'caliphate' Baghdadi declared in June 2014, and the operation to recapture it is Iraq's largest in years. / AFP / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)

Shiite fighters from the Popular Mobilization Forces arrive in an area south of Mosul, on October 22, 2016, during an operation to retake the main hub city from the Islamic State (IS) group jihadists.
Mosul is the most populous city in the 'caliphate' Baghdadi declared in June 2014, and the operation to recapture it is Iraq's largest in years.  / AFP / AHMAD AL-RUBAYE        (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)