Members of the Iraqi federal police wave the country's flag as they celebrate in the Old City of Mosul on July 9, 2017. Iraq declared victory against ISIS forces in Mosul after a grueling monthslong campaign. The battle to reclaim Mosul, the last major ISIS stronghold in Iraq, has been underway since fall 2016. FADEL SENNA/AFP/Getty Images

This injured girl was found by Iraqi forces as they advanced against ISIS militants in the Old City of Mosul on Monday, July 3. She was carried away for medical assistance. Felipe Dana/AP

A suspected ISIS fighter is held in a basement while Iraqi forces continue to push for control of the Old City of Mosul on Monday, July 3. Felipe Dana/AP

An Iraqi Special Forces soldier exchanges fire with ISIS militants in the Old City on Friday, June 30. Felipe Dana/AP

A bomb explodes near the al-Nuri mosque complex on Thursday, June 29. Iraq's military has seized the remains of the Great Mosque of al-Nuri. Iraq and the United States have accused ISIS of blowing up the historic mosque. Felipe Dana/AP

Members of the Iraqi Federal Police hold a position as US-led coalition forces advance through the Old City on Wednesday, June 28. AHMAD AL-RUBAYE/AFP/Getty Images

The remnants of Mosul's ancient leaning minaret are seen in the Old City on Sunday, June 25. ISIS' claim that US warplanes were responsible for the destruction of the minaret is "1,000% false," US officials told CNN. MOHAMED EL-SHAHED/AFP/Getty Images

Two boys comfort each other after their home collapsed during fighting between Iraqi forces and militants in Mosul on Saturday, June 24. The boys, who are cousins, said some of their relatives were still under the rubble. Felipe Dana/AP

An Iraqi soldier helps transport a girl as residents flee their homes west of Mosul on Friday, May 26. KARIM SAHIB/AFP/Getty Images

Displaced Iraqis make their way through rubble after evacuating their homes in a neighborhood of west Mosul on Wednesday, May 17. FADEL SENNA/AFP/Getty Images

An Iraqi man tries to extinguish a burning car during fighting in Mosul's western Rifai neighborhood on Tuesday, May 16. AHMAD AL-RUBAYE/AFP/Getty Images

A member of the Iraqi counterterrorism service secures a building as troops push toward Mosul's Al-Oraibi western district on Sunday, May 14. AHMAD AL-RUBAYE/AFP/Getty Images

A smoke cloud rises on the front line as the Iraqi Emergency Response Division advances in west Mosul on Saturday, May 6. FADEL SENNA/AFP/Getty Images

A wounded man is transported in western Mosul on Friday, April 21. CHRISTOPHE SIMON/AFP/Getty Images

An Iraqi federal policeman smokes during a break from battle on Wednesday, April 12. Carl Court/Getty Images

A member of Iraq's security forces stands guard in eastern Mosul as smoke rises from the ISIS-controlled western section of the city on Friday, April 7. AHMAD GHARABLI/AFP/Getty Images

Iraqis visit a bath house on the southern outskirts of Mosul on Wednesday, April 5. AHMAD GHARABLI/AFP/Getty Images

Flames billow from an explosion in Mosul during a clash between Iraqi forces and ISIS fighters on Sunday, March 5. ARIS MESSINIS/AFP/Getty Images

Families are forced to evacuate as Iraqi forces advance in western Mosul on Thursday, March 2. The number of internally displaced people has surged as the offensive effort has intensified. Martyn Aim/Getty Images

Mosul residents cross a damaged bridge in the al-Sukkar neighborhood on Saturday, January 21. DIMITAR DILKOFF/AFP/Getty Images

French President Francois Hollande and French Defense Minister Jean-Yves Le Drian, right, view territory held by ISIS during a visit to a military outpost near Mosul on Monday, January 2. CHRISTOPHE ENA/AFP/Getty Images

A young girl takes part in a Christmas Day Mass at a church in the predominantly Christian town of Qaraqosh. The area's churches were heavily damaged by ISIS militants before the town was freed by Iraqi forces during the Mosul offensive. Chris McGrath/Getty Images

Iraqi Shiite fighters ride through a desert area near the village of Al-Boutha al-Sharqiyah, west of Mosul, on Friday, December 2. AHMAD AL-RUBAYE/AFP/Getty Images

Internally displaced Iraqis who fled the fighting in Mosul watch as a civilian drone films them at the al-Khazir camp on Thursday, December 1. THOMAS COEX/AFP/Getty Images

An Iraqi soldier searches a home for ISIS militants after Iraqi forces retook the village of Al-Qasr on Wednesday, November 30. Manu Brabo/AP

Iraqi soldiers transport a comrade who was injured during a battle near the village of Haj Ali on Tuesday, November 29. Hussein Malla/AP

A man mourns during the funeral of four Iraqi paramilitary fighters who were killed in battles in the town of Tal Afar. HAIDAR MOHAMMED ALI/AFP/Getty Images

Displaced civilians return to the village of Tall Abtah on Friday, November 25, after Iraqi forces retook the village from ISIS. THOMAS COEX/AFP/Getty Images

Iraqi civilians sit on the ground in Mosul on November 24. An Iraqi officer addressed the group, demanding to know the whereabouts of alleged ISIS militants who opened fire on troops a few days earlier. Hussein Malla/AP

An injured baby receives treatment at a field hospital in Mosul on November 15. Felipe Dana/AP

A woman cries Sunday, November 13, after seeing the St. Addai church that was damaged by ISIS fighters during their occupation of the Keramlis village. Hussein Malla/AP

An Iraqi special forces soldier prays next to a Humvee before troops pushed toward Mosul's Karkukli neighborhood on November 13. Odd Andersen/AFP/Getty Images

A Kurdish Peshmerga fighter holds part of a defused bomb planted by ISIS militants in Bashiqa, Iraq, on Friday, November 11. Adam Schreck/AP

A member of Iraq's special forces guards two suspected ISIS fighters found hiding in a house in Mosul on November 11. Odd Andersen/AFP/Getty Images

An Iraqi woman displaced by war holds her cat near a checkpoint in the Iraqi village of Shaqouli, east of Mosul, on November 10. ODD ANDERSEN/AFP/Getty Images

Iraqi troops watch a broadcast of Donald Trump's acceptance speech in a house in Arbid, on the outskirts of Mosul, on Wednesday, November 9. Iraqi Prime Minister Haider al-Abadi congratulated Trump on his win and said he hoped for continued support in the war on ISIS. AHMAD AL-RUBAYE/AFP/Getty Images

US Marines install equipment at a coalition base in Qayyara on November 9. Marko Drobnjakovic/AP

An Iraqi forces member investigates a mass grave that was discovered after coalition forces recaptured the area of Hamam al-Alil on Monday, November 7. AHMAD AL-RUBAYE/AFP/Getty Images

Iraqi children witness a man being interrogated by a member of the Iraqi army at a base next to the Al-Intissar neighborhood of Mosul on November 7. ODD ANDERSEN/AFP/Getty Images

A civilian man who fled the fighting trims his beard after reaching an Iraqi army position in Mosul on November 7. ODD ANDERSEN/AFP/Getty Images

Children play in debris created by an airstrike in Qayyara on Sunday, November 6. Felipe Dana/AP

Female members of the Freedom Party of Kurdistan sing as they hold a position near Bashiqa on November 6. SAFIN HAMED/AFP/Getty Images

A baby is passed through a fence back to his mother at a refugee camp in the Khazir region on Saturday, November 5. BULENT KILIC/AFP/Getty Images

People line up to receive food at a refugee camp in the Khazir region on November 5. Thousands are taking refuge in camps set up for internally displaced people. BULENT KILIC/AFP/Getty Images

Iraqi soldiers pass near a bridge destroyed in an airstrike in Qayyara on November 5. Felipe Dana/AP

Iraqi soldiers patrol an alley on the outskirts of Mosul on Friday, November 4. Marko Drobnjakovic/AP

A suspected member of ISIS is detained at a checkpoint near Bartella, Iraq, on November 4. Felipe Dana/AP

Iraqi families pack into a truck to be moved to camps on Thursday, November 3. BULENT KILIC/AFP/Getty Images

An Iraqi special forces soldier searches for the location of an ISIS sniper in Gogjali on November 1. Marko Drobnjakovic/AP

A man fleeing the village of Bazwaya carries a white flag as he arrives at a checkpoint on November 1. ZOHRA BENSEMRA/Newscom/REUTERS

An Iraqi soldier receives treatment after being injured during clashes with ISIS fighters near Bazwaya on October 31. BULENT KILIC/AFP/Getty Images

An Iraqi soldier navigates through a shattered windshield as coalition forces advance on Bazwaya on October 31. BULENT KILIC/AFP/Getty Images

Archbishop Yohanna Petros Mouche, center, performs Mass in the liberated town of Qaraqosh on Sunday, October 30. SAFIN HAMED/AFP/Getty Images

Children play in a camp for internally displaced people near Kirkuk, Iraq, on October 30. More than 600 families from Tel Afar, a town west of Mosul, have been living in the camp since ISIS took control of the area in 2014. Felipe Dana/AP

Displaced families are seen on the road near Qayyara on Saturday, October 29. BULENT KILIC/AFP/Getty Images

U.S. military personnel take cover in a bunker after a mortar alarm was sounded at a coalition air base in Qayyara on Friday, October 28. Marko Drobnjakovic/AP

Women and children grieve over the grave of a family member at a Qayyara cemetery damaged by ISIS on October 27. Marko Drobnjakovic/AP

Residents of Qayyara wait for distribution of food and water rations on October 26. Local water sources have been contaminated by the burning oil and sulfur. Carolyn Cole/Los Angeles Times/Getty Images

Iraq's counterterrorism forces advance toward ISIS positions in Tob Zawa on October 25. Khalid Mohammed/AP

Soldiers give first aid to an injured boy in Tob Zawa on October 25. Qassim Abdul-Zahra/AP

Kurdish Peshmerga forces take positions as they start to move toward the Imam Reza and Tizxirab villages of the Bashiqa district on Sunday, October 23. Yunus Keles/Anadolu Agency/Getty Images

Iraqi forces distribute fruit in the village of al-Khuwayn, south of Mosul, after recapturing it from ISIS on October 23. AHMAD AL-RUBAYE/AFP/Getty Images

Kurdish security forces detain a suspected member of ISIS in the eastern suburbs of Kirkuk on Saturday, October 22. MARWAN IBRAHIM/AFP/Getty Images

An Iraqi forces member helps a man push a car as they arrive at a refugee camp in Qayyara on October 22. BULENT KILIC/AFP/Getty Images

Spent bullet cartridges litter the street around the Jihad Hotel, where ISIS militants battled Iraqi security forces in Kirkuk on Friday, October 21. Yunus Keles/Anadolu Agency/Getty Images

Gen. Abdel Ghani al-Asadi, who leads Iraq's counterterrorism forces, sits in Bartella on October 21 after the town was reclaimed. Khalid Mohammed/AP

Peshmerga fighters look over a village during an assault near Bashiqa on Thursday, October 20. SAFIN HAMED/AFP/Getty Images

Iraqi forces head toward the front lines near Qayyara on Tuesday, October 18. BULENT KILIC/AFP/Getty Images

A Peshmerga fighter peers up from an underground tunnel in the liberated town of Badana on October 18. ISIS fighters have built tunnels below residential streets to escape from airstrikes. Bram Janssen/AP

Kurdish security forces take up a position near ISIS-controlled villages on Monday, October 17. Uncredited/AP

Smoke rises from a suicide car bomb attack carried out by ISIS in the village of Bedene on October 17. Anadolu Agency/Getty Images

Members of the Iraqi coalition gather around a fire at Zardak mountain ahead of the offensive. SAFIN HAMED/AFP/Getty Images