Almost 20 tonnes of manure went up in flames after a bonfire spiralled out of control.
Firefighters from Ely were called to a field in New River Bank, Littleport, shortly before 11am following reports of a fire in the open.
A spokesman for Cambridgeshire Fire and Rescue Service said: “An unattended bonfire had spread to a muck heap, which was made up of about 20 tonnes of waste material.
“Firefighters created a break to stop the fire spreading to surrounding buildings, which included a stable block, and used water to extinguish it.
“The smouldering material was left to be monitored by the land owner and the crew will continue to make regular inspections will be made.”
An investigation determined that the cause of the fire was accidental.
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