Just minutes before 16:00hrs the box alarm was dispatched for a warehouse on fire in the 4400 block of Bluebonnet Dr. Responding information was a fire inside the business with ammunition present and for companies to use caution. Upon arrival Engine 22 advised of nothing visible from the exterior but a moderate smoke condition inside. With companies locating the fire in a piece of machinery the fire was extinguished and ventilation completed. Upon completion of assignments all units returned to service.