BIDDEFORD – Building and insurance inspectors determined Sunday that a downtown building that was destroyed by fire would have to be torn down.

Officials were making plans to demolish the three-story Mahaney Building, which was gutted Saturday by the four-alarm fire that apparently began in a trophy shop on the ground floor.

Building owner Ed Caron said the owner of Coastal Awards, Eunice Marquis, told him that she was using a laser engraving machine when it caught fire.

Firefighters from neighboring communities including Saco, Kennebunk and Old Orchard Beach helped battle the blaze. One firefighter was treated at Southern Maine Medical Center after suffering minor sprains and bruises from a fall.