At ~ 12:40 AM, Westmoreland 911 dispatched Station 20 (Murrysville VFC) to assist Station 59 (Slickville VFC) for an Automatic Fire Alarm (AFA)at Ark Senior Services. Station 20 responded with 5 firefighters (including Lieutenant 20) going to the station to crew Truck 20. Westmoreland 911 also dispatched the following additional stations to assist Station 59: Station 22 (Export VFC), Station 30 (Delmont VFC), Station 64 (White Valley VFC), Station 87 (Harrison City VFC), and Station 90 (Forbes Road VFC). Station 59 units arrived on scene, found no smoke or fire coming from the structure, and upon investigation found that the AFA System had been an accidentaly activation. Command 59 cancelled all responding units. Truck 20 remained in service and in station.