The cause of Tuesday's Rockhill Apartments fire remains undetermined as investigators continue to piece together the devastating blaze, the territory's fire marshal says.

SA国际影视传媒淲e are in the very early stages of the investigation,SA国际影视传媒� NWT Fire Marshal Chucker Dewar told Yellowknifer Wednesday.

Dewar said the Office of the Fire Marshal is working closely with Yellowknife to probe the fire SA国际影视传媒� and to ensure all apartment residents have been accounted for.

SA国际影视传媒淲e believe we have accounted for all the registered occupants at this time,SA国际影视传媒� said Dewar.

In the chaotic moments that followed the early morning fire SA国际影视传媒� which left 33 families homeless SA国际影视传媒� several witnesses told Yellowknifer the fire began on the building's first-floor.

Dewar confirmed the fire's area of origin has been pinned to the first-floor by investigators. But it's still too early to say what caused the fire, which spread rapidly to the building's upper floors.

SA国际影视传媒淥ur focus right now is on that area to determine if there's anything there that we can uncover that would contribute to understanding what caused the fire,SA国际影视传媒� said Dewar.

To get a complete picture of what happened, Dewar said investigators will be looking to the accounts of witnesses at the scene.

SA国际影视传媒淲e'll be working with and we'll be interviewing and obtaining statements from emergency responders, eye witnesses, tenants and members of the public,SA国际影视传媒� he said.

The building's tenants escaped the fire unharmed, but one officer was treated for smoke inhalation following the blaze, according to a news release from Yellowknife Mounties earlier this week.

While the investigation is still in its infancy, Dewar said there's nothing to indicate the fire was suspicious in nature. But until the probe is complete, investigators can't speculate, he said.

The immense heat of Tuesday's blaze stripped the siding of the neighbouring Fraser Arms East apartment building, owned by Midwest Property Management.

A representative from the company told Yellowknifer the cost of the damage has yet to be determined.

Dewar is asking anyone with information about Tuesday's fire to contact the Office of the Fire Marshal at 867-767-9161.