A fire took hold of an apartment at Yellowknife's Crestview Manor building on Sunday morning.
Three fire trucks and two ambulances joined RCMP outside the 52 Avenue complex at around 8am.
The fire appeared concentrated in the area of a first-floor apartment at the rear of the building.
John Fredericks, the city's fire chief, said there were no reported injuries.
Fredericks said while much of the building was not affected by the fire, power to the complex had been disconnected and it may be some time before residents can return.
Whether that would mean alternative shelter arrangements being put in place had not yet been decided, Fredericks said.
Streets in the vicinity were blocked off during the incident. RCMP officers could be seen approaching potential witnesses to the incident while firefighters worked.
By 8:30am the fire was under control and flames could not be seen from the street, but a small plume of smoke continued to escape the building. The fire appeared out by 9am.
Video taken by onlookers earlier in the morning showed thick smoke and flames pouring from the area of the first-floor apartment as the fire began.
Crestview Manor, managed by Northview REIT, is a 20-suite apartment building.
It lies adjacent to a lot where the Polaris building, a 17-unit complex, burned down four years ago. A 33-unit transitional housing complex two streets away, the Rockhill building, was destroyed by fire last fall.