Ten tonnes of pallets and straw were set ablaze by arsonists in Manea.
The fire started at about 9.50 on Monday night in an open area off Wisbech Road.
Fire crew from Manea were called to the scene but had to radio for extra help as more water was needed to put out the fire.
Extra engines arrived from March, Chatteris and Sutton to help which took more than two and a half hours to extinguish the flames.
A Cambridgeshire fire and rescue service spokesman said the cause of the fire was arson.
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