A health worker is seen at the Nablus Field Hospital in the old city of Mosul, Iraq, Dec. 3, 2020. (Photos: Xinhua)

Young people sit in a vehicle in the old city of Mosul, Iraq, Dec. 3, 2020.

A health worker is seen at the Nablus Field Hospital in the old city of Mosul, Iraq, Dec. 3, 2020.

A man drives a tricycle in the destroyed old city of Mosul, Iraq, Dec. 3, 2020.

Health workers are seen at the Nablus Field Hospital in the old city of Mosul, Iraq, Dec. 3, 2020.

Photo taken on Dec. 3, 2020 shows the destroyed old city of Mosul, Iraq.

A health worker is seen at the Nablus Field Hospital in the old city of Mosul, Iraq, Dec. 3, 2020.

Resident Abdul Razzaq Mohammed, 58, walks in the destroyed old city of Mosul, Iraq, Dec. 3, 2020.

An ambulance drives out of the al-Salam hospital in east Mosul, Iraq, Dec. 3, 2020.