At ~1:58 PM Westmoreland 911 dispatched Station 20 (Murrysville VFC) for an Automatic Fire Alarm (AFA) at Redstone Highlands-Murrysville. Station 20 responded with 2 firefighters (including Assistant Chief 20) going to the scene, and 4 firefighters going to the station to crew Engine 20. Westmoreland 911 dispatched the following additional stations to support Station 20: Station 22 (Export VFC), Station 64 (White Valley VFC), Station 78 (Sardis VFC), Station 87 (Harrison City VFC), Station 170 (Monroeville #4), and Station 610 (Murrysville Medic One). The direct responding firefighters arrived on scene, Assistant Chief 20 established the command, and found no fire or smoke coming from the structure. Upon investigation Command 20 found the alarm was caused by a broken sprinkler head, so all responding stations except for Station 20 were returned, and Engine 20 was held in station. The on scene Station 20 firefighters assisted the facility maintenance staff to remediate the waterflow issue, and Command 20 returned Engine 20 to service.