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An Iraqi boy, whose family fled the city of Ramadi after it was seized by Islamic State (IS) group militants, carries a block of ice at a camp housing displaced families on May 18, 2015 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)

An Iraqi boy, whose family fled the city of Ramadi after it was seized by Islamic State (IS) group militants, carries a block of ice at a camp housing displaced families on May 18, 2015 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)