Officials say it was testing at an indoor munitions range that started a fire at a Department of Defense test facility in Harford County Monday morning.
Crews from Abingdon, Aberdeen, Bel Air, Joppa, Susquehnna Hose and APG worked the scene at Compass Point Road for about 1.5 hours.
Officials say the fire was controlled in less than 30 minutes to a large room in the facility.
The building reportedly suffered minor smoke damage and moderate fire water and smoke damage to the room of origin. Two people were taken to the hospital with injuries not believed to be life-threatening.