Thunder Bay Fire Rescue were called to a fire along Bethune Street.
Crews responded to a structure fire on Bethune St. Thursday afternoon.
The first arriving fire crews encountered heavy smoke coming from the three story residential building. The building was found to be partially boarded up making entry and fire attack difficult.
The interior of the main floor of the building sustained substantial fire and smoke damage.
All occupants were out of the building when fire crews arrived. No injuries to either the public or firefighters are reported.
The fire scene remains under investigation.
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