AMHERST, NH - On May 14th, Amherst Fire Alarm began receiving calls for a house explosion with fire on Clark Avenue. C1 arrived on scene with smoke showing and then reported the dwelling to be fully involved and beginning to collapse. Command quickly struck a second-alarm, bringing more manpower to the scene and to cover. Command eventually struck three alarms. Crews remained on scene for several hours overhauling and extinguishing the fire. The fire is now under investigation.