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Shiite fighters from the Popular Mobilisation units flash the sign for victory in Tikrit on April 1, 2015, a day after the Iraqi Prime Minister Haider al-Abadi declared victory in the weeks-long battle to retake the northern Iraqi city from the Islamic State (IS) group. Iraqi forces battled the last jihadists in Tikrit to seal a victory the government described as a milestone in efforts to rid the country of the jihadist group. AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)

Shiite fighters from the Popular Mobilisation units flash the sign for victory in Tikrit on April 1, 2015, a day after the Iraqi Prime Minister Haider al-Abadi declared victory in the weeks-long battle to retake the northern Iraqi city from the Islamic State (IS) group. Iraqi forces battled the last jihadists in Tikrit to seal a victory the government described as a milestone in efforts to rid the country of the jihadist group. AFP PHOTO / AHMAD AL-RUBAYE        (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)