Police in Sarnia, Ont., rescued a man from a burning apartment building early on Monday.
The fire broke out on North Christina Street just after midnight.
Two officers arrived before the fire crews and were told by tenants who had escaped that there was still a man inside.
Const. Heather Emmons said the officers found the 55-year-old on the smoke-filled upper floor of the building and brought him out.
"Even though there was obvious smoke coming he went in because of the information received that someone was still inside," Emmons said.
The 55-year-old was taken to a London hospital in critical condition.
The officers, as well as someone who had been riding along on patrol with them, were also treated for smoke inhalation and later released from hospital.
Police say a hot plate started the fire.
Several people were displaced from their apartments for the night.