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Shiite fighters from the Popular Mobilisation units celebrate on a truck inside the northern Iraqi city of Tikrit on March 31, 2015 during a military operation to retake it from the Islamic State (IS) group. Prime Minister Haider al-Abadi Prime Minister said security and allied forces backed by US-led coalition aircraft "liberated" Tikrit, 80 miles (130 kilometers) north of Baghdad, the country's biggest victory yet in the fight against IS jihadists.    AFP PHOTO / STR        (Photo credit should read -/AFP/Getty Images)
Shiite fighters from the Popular Mobilisation units celebrate on a truck inside the northern Iraqi city of Tikrit on March 31, 2015 during a military operation to retake it from the Islamic State (IS) group. Prime Minister Haider al-Abadi Prime Minister said security and allied forces backed by US-led coalition aircraft "liberated" Tikrit, 80 miles (130 kilometers) north of Baghdad, the country's biggest victory yet in the fight against IS jihadists.    AFP PHOTO / STR        (Photo credit should read -/AFP/Getty Images)

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ISIS retreats from liberated city

CNN's Arwa Damon and her crew are inside the city center of Tikrit after Iraqi forces say they drove ISIS fighters from the city.

ISIS retreats from liberated city

CNN's Arwa Damon and her crew are inside the city center of Tikrit after Iraqi forces say they drove ISIS fighters from the city.