A destroyed mosque in the Old City of Mosul, during the government forces' offensive to retake the city from ISIS fighters on July 2, 2017. #

Smoke billows over the Old City after an airstrike in Mosul on July 3, 2017. #

A tank of the Emergency Response Division fires at Islamic State militants in the old city of Mosul on July 5, 2017. #

A member of Iraq's Counter-Terrorism Service advances in the Old City of Mosul on July 5, 2017. #

An external view of Mosul's main hospital complex shows damage after it was retaken by Iraqi forces on July 4, 2017. #

An external view of Mosul's main hospital complex, after it was retaken, on July 4, 2017. #

Destroyed vehicles around the ruins of Al-Nuri Mosque in the Old City of Mosul, on July 2, 2017. #

Iraqi Emergency Response Division troops in the ISIS-occupied Old City district where heavy fighting continues on July 4, 2017 in Mosul. #

Members of the Emergency Response Division break into buildings during a fight with Islamic State militants in the Old City of Mosul on July 3, 2017. #

An Iraqi Counter-Terrorism Services member prays in the Old City of Mosul on July 3, 2017 during an ongoing offensive to retake the city. #

An Iraqi boy carries a girl on his back while fleeing from the Old City of Mosul on July 5, 2017. #

A Federal Policeman walks inside a building in Mosul's damaged main hospital complex after it was retaken by Iraqi forces on July 4, 2017. #

An Iraqi forces' Humvee sits parked outside the destroyed gate of Al-Nuri Mosque in the Old City of Mosul on July 5, 2017. #

A displaced woman sits near the ruined Grand al-Nuri Mosque in the Old City on July 1, 2017. #

Iraq's elite Rapid Response Division patrol the Shifa neighborhood, on the west bank of Mosul, on July 1, 2017. #

Members of Federal Police sitting in a burned-out building flash a victory sign during the fight with ISIS in the Old City of Mosul on July 3, 2017. #

A member of Iraq's Rapid Response Division carries the national flag as he patrols the Shifa neighborhood, on the west bank of Mosul, on July 1, 2017. #

Fleeing Iraqi civilians walk past the heavily damaged al-Nuri mosque as smoke rises in the background in the Old City of Mosul, on July 4, 2017. #

Federal Police Rapid Response Force fighters stand inside Mosul's main hospital complex on July 4, 2017. #

Smoke billows in the background of a street as Iraqi forces advance through the Old City of Mosul on June 30, 2017. #

Iraqis walk in the Old City of Mosul on July 3, 2017 during an ongoing offensive to retake the city. #

An Iraqi Special Forces soldier walks in the destroyed al-Nuri mosque complex in Mosul's Old City on July 2, 2017. #