Engines from Industrial Ave,West Main,Piney Forest,the airport and the engine and ladder from the Bridge St stations responded with (25) firefighters to a three alarm apartment fire at 315 Stephens St.The first arriving engine reported smoke coming from the two story apartment's roof.(3) attack lines were pulled to attack this fire.The interior firefighting units opened the attic areas to only find trapped smoke.Upon further investigation it was found that fire was trapped in the adjoining walls between two apartment units.It took approximately 30 minutes to access the area where the fire originated.Units remained on the scene for almost four hours extinguishing hot spots and making sure that the fire was completely out.No injuries were reported and (14) occupants were displaced ;however the Red Cross was not needed at this particular time.Cause of ignition is currently under investigation and two apartment units sustained moderate smoke and water damage