Thunder Bay Fire Rescue battled a house fire overnight on the city's north side.

Just after 1 a.m. Friday, firefighters arrived at 365 Winnipeg Ave. to find a house burning, with heavy smoke and flame showing.

Two people got out of the house unharmed, while firefighters later rescued the family dog and gave it oxygen. 

Firefighters knocked the fire down but not before there was extensive damage.

Neighbours told CBC News Friday morning that they saw big flames coming out of the windows to the home's kitchen.

Fire Rescue says the cause of the fire was  accidental.