Walnut Ridge, AR-- A fire destroyed a Region 8 business in Walnut Ridge Thursday evening. Firefighters say the Morgan Building and Spa factory was fully involved in flames when they arrived. All the fire fighting resources in the area were called out. Nearly 50 firefighters from four different fire departments battled the blaze. The plant was closed when the fire broke out so there was no one inside, but two firefighters were treated for heat exhaustion. Officials don't yet know how the fire started, or how much damage it caused.