Firefighters were called to 85 Walnut St. in London, Ont. on Sunday, Feb. 2, 2020 following a fire that sent a man to hospital. (Gerry Dewan / CTV London)

A man has life-threatening injuries after a fire in an apartment building on Walnut Street in London.

Emergency responders were called to the building at 85 Walnut Street Sunday over the noon hour.

A neighbour noticed smoke coming out the door of a unit on the second floor and called 911.

Crews broke down the door to gain access.

A neighbour tells CTV News she saw firefighters pull a man from the unit and perform CPR before he was rushed to hospital.

The complex is operated by London Middlesex Community Housing.