Emergency services are in attendance at an outbuilding fire on Bath Road, in Box.
Crews from Corsham and Bath were called to the incident, first reported at 1.49pm.
They are still in attendance at the fire, which began within an industrial outbuilding.
They have requested the assistance of an additional pump and a water carrier. The building which is used for storage, has partially collapsed.
Firefighters are using two hose reels to tackle the flames.
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