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A picture taken on May 18, 2015 shows tents housing families who fled the city of Ramadi after it was seized by Islamic State (IS) group militants in Bzeibez, on the southwestern frontier of Baghdad with Anbar province. Shiite militias converged on Ramadi in a bid to recapture it from jihadists who dealt the Iraqi government a stinging blow by overrunning the city in a deadly three-day blitz. AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)

A picture taken on May 18, 2015 shows tents housing families who fled the city of Ramadi after it was seized by Islamic State (IS) group militants in Bzeibez, on the southwestern frontier of Baghdad with Anbar province. Shiite militias converged on Ramadi in a bid to recapture it from jihadists who dealt the Iraqi government a stinging blow by overrunning the city in a deadly three-day blitz. AFP PHOTO / AHMAD AL-RUBAYE        (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)