DULUTH, MN (KDAL) - Over two dozen firefighters from five fire stations battled a fire at 1511 East Superior Street that was reported just after midnight on Monday morning. Fire was active on the first and second floors of the three story structure when firefighters arrived and they were able to keep it from spreading to the third floor. The building was not occupied at the time of the fire and no injuries were reported. Damage was estimated to be in excess of 150 thousand dollars. The fire is under investigation by the Duluth Fire Marshal's Office.