Companies sent to 113 Willow Street in Lower Paxton Township for a structure fire shortly after 1530 hours. A first alarm was given enroute due to a heavy column of smoke. Engine 33 (Colonial Park) arrived on location with a working fire in an unoccupied, private dwelling and secured a hydrant and went in service with attack lines. The fire involved the exterior of the dwelling with extension to the interior and cockloft. Companies did a great job in knocking down the heavy fire and preventing further damage. Units remained on the scene for several hours performing overhaul.