A late-night fire caused significant damage to a home on Walnut Street in Sault Ste. Marie, with no injuries reported.

Fire crews were called to the residence shortly before midnight Wednesday and arrived to find flames and heavy smoke coming from the building.

Responders managed to contain and extinguish the blaze, but the main floor sustained extensive fire and smoke damage.

An investigation determined the fire originated on the main floor. However, its cause remains unknown.