Fall River, Ma. Around 10:15 am firefighters responded to 125 Warren St. for a still alarm. Engine 4 arrived on scene and reported smoke showing and a possible structure fire. Based on the information from Engine 4 command ordered an additional engine company to respond. Firefighters stretched the Leader lines off of engine 4 as the home was set back well off the street. Firefighters found fire in the walls and ceiling on the second floor with a heavy smoke condition on the third floor of the three story wood frame home. Firefighters used thermal imaging cameras to locate the hidden flames and to open up the walls and ceilings.