Fire fighters are battling a blaze at an outdoor structure which contains two propane cylinders.
Four appliances from Wisbeach, Downham Market, and Littleport fire stations are at a building off Flint House Road in Three Holes, near Wisbech, Cambridgeshire.
The outdoor structure measures 20 x 5m and crews are using main jets and a thermal image camera to keep an eye on the cylinders.
Emergency services were alerted to the fire at 7.40pm this evening (Sunday).
Crews were still working at the scene at 11pm, a spokesman for Norfolk and Fire and Rescue Service said.
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