The state fire marshal's office is investigating two fires at the Carroll County Equestrian Center on Grimville Road near Mount Airy.
Deputy fire marshals were called by the center's caretakers yesterday after a portable toilet was burned sometime Sunday. A portable toilet also was burned April 5. The damage is estimated at $1,300.
Both fires have been ruled as arson.
Anyone with information on either incident is asked to call 888-214-7892.