FIRE UNITS RESPONDED LATE LAST NIGHT TO A REPORTED SHED FIRE IN THE 2100 BLOCK OF MURRAY AVENUE.  CHIEF DELNEGRO ARRIVED ON SCENE AND TRANSMITTED THE WORKING FIRE SIGNAL FOR A 10x25 WOOD SHED ON FIRE AT THE REAR OF THE STRUCTURE WITH EXPOSURE PROBLEMS.  ENGINE 6 ARRIVED AND STRETCHED IN WITH AN 1 3/4 ATTACK LINE AND BEGAN TO DARKEN DOWN THE FIRE.  NO EXTENSION TO THE MAIN STRUCTURE WAS REPORTED.  INSPECTORS ON SCENE DETERMINED THAT A WOOD BURNING STOVE ON THE EXTERIOR WAS RESPONSIBLE FOR THE FIRE.