MADISON, Wis. -

The exact cause of a Thanksgiving Day fire that injured one person remains undetermined, officials said.

Madison Fire Department spokesman Joel Kneifel said a fire was reported at about 3:40 p.m. on the 1300 block of Morrison Street. A smoke alarm alerted the residents of the building to the fire, according to a release. They immediately called 911 and helped get the rest of the residents and a dog out of the building.

When firefighters arrived, smoke was visible from the roof. They entered the building and encountered heavy smoke in the third floor apartment. It took fire crews about 20 minutes to knock down the fire, according to a release. Additional fire crews did a search throughout the rest of the building to confirm that there were no other people trapped inside.

One resident was taken to the hospital and later released.

The home was heavily damaged by the fire, and the residents were assisted by Red Cross to find accommodations. Damages are estimated at $60,000.

Investigators said the fire originated on the upper floor in a finished attic living area, but the exact cause cannot be determined because unattended burning candles, improperly-discarded smoking materials or a possible electrical arc cannot be ruled out as causes.