At ~4:36 PM, Westmorland 911 dispatched Station 20 (Murrysville VFC) to assist Station 22 (Export VFD) for a strong odor of natural gas inside of Duff Manor in Export, PA. Also dispatched were Station 64 (White Valley VFD), Station 63 (Claridge VFD), Station 30 (Delmont VFD), and Station 78 (Sardis VFC). Station 20 responded with Truck 20 (4 firefighters including Captain 20). Engine 22-2 (including Chief 22) was first on scene and after an initial interior search cancelled all responding units (including Truck 20) except for Engine 64 and Truck 30. Truck 20 returned to station.