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Iraqi security forces gather on the outskirts of Fallujah as they prepare an operation aimed at retaking the city from the Islamic State (IS) group, on May 22, 2016.
Iraqi forces have in recent days been massing around Fallujah, a city which lies only 50 kilometres west of Baghdad and which has been out of government control since January 2014. / AFP / AHMAD AL-RUBAYE        (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
Iraqi security forces gather on the outskirts of Fallujah as they prepare an operation aimed at retaking the city from the Islamic State (IS) group, on May 22, 2016.
Iraqi forces have in recent days been massing around Fallujah, a city which lies only 50 kilometres west of Baghdad and which has been out of government control since January 2014. / AFP / AHMAD AL-RUBAYE        (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)

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    Iraqi army launches massive offensive to retake Falluja

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Iraqi army launches massive offensive to retake Falluja

The Iraqi army, backed by U.S. airstrikes, has launched a massive operation to retake Falluja, which has been in the hands of ISIS since January of 2014.

Iraqi army launches massive offensive to retake Falluja

The Iraqi army, backed by U.S. airstrikes, has launched a massive operation to retake Falluja, which has been in the hands of ISIS since January of 2014.