At ~ 12:16 AM, Westmoreland 911 dispatched Station 20 (Murrysville VFC) for an Automatic Fire Alarm (AFA) at the Franklin Regional Middle School. Station 20 responded with Truck 20 (4 firefighters), with Assistant Chief 20 going directly to the scene. Westmoreland 911 also dispatched the following additional stations to support Station 20: Station 22 (Export VFC), Station 64 (White Valley VFC), Station 78 (Sardis VFC), Station 236 (Holiday Park VFC), and the Murrysville Police. Assistant Chief 20 was first on scene, established command, found no smoke or fire coming from the structure, and after an initial walk-thru with the school maintenance personnel, returned all responding units except for Truck 20 and Squad 22. Upon further investigation, it was determined to be a malfunction of the School's AFA System. Command 20 returned Truck 20 and Squad 22 to service and station.