Last night Valhalla Fire was dispatched to assist North White Plains Fire Company No. 1 at the scene of a house fire. We responded with Tower Ladder 49 and Engine 84. Upon arrival of first arriving units heavy fire was found extending up the rear of the house extending into the house. Units assisted with extinguishing the fire and checking for extension. Units on scene made a great stop inside the structure to prevent the fire from spreading through out the house. Other departments on scene included West Harrison Fire Department, Thornwood Fire Department, and Valhalla Ambulance Corps.