FITCHBURG, MA - Fitchburg firefighters battled a stubborn fire in a four-story brick apartment building in the early morning on January 5th. Companies arrived to find smoke showing from the building and located an apartment fire on the 4th floor. Command struck a 2nd alarm, bringing in mutual aid to the scene. The fire extended into some void spaces and command struck a 3rd alarm. The fire was knocked down a short time later and companies remained on scene overhauling and checking for extension.