Arsonists caused a blaze involving 600 tonnes of straw at a farm in March.
Cambridgeshire Fire & Rescue Service (CFRS) were called to the fire in the open on Binnimoor Road at 7.25am on Sunday October 20.
"Firefighters arrived to find around 600 tonnes of straw on fire," said a spokesperson for CFRS.
"Working with the farmer and police colleagues, they made the area safe for the fire to burn in a controlled way.
"Crews made regular inspections to make sure the area remained safe and the fire hadn’t spread.
"The cause of the fire is believed to be deliberate."
A spokesperson for Cambridgeshire Constabulary said: "We will continue to be in the area when we can to ensure everything is okay," said a police spokesperson this morning.
"Enquiries into the matter are ongoing."
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