DULUTH, MN (KDAL) - Duluth firefighters responded to a house fire at 309 North 63rd Avenue West at 1:43 a-m Wednesday. They arrived on the scene to find the enclosed front porch of the structure fully involved in fire. The homeowner had escaped the fire with her 4 year old son who woke her up when he heard the smoke alarms sounding. Although the fire was confined to the porch area, the entire structure had significant heat and smoke damage. About 40 thousand dollars in damage was estimated by the Fire Department. The origin and cause of the fire is still under investigation.