Crews were called to Pelican Oils on Barracks Road on Sandy Industrial Estate at 10:20pm last night (Monday).
The cooking oil recycling centre contained 60 tonnes of waste oil and 500 tonnes of kerosene.
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David Cameron has arrived in Peterborough to celebrate his party's victory in the local elections.
Most areas will have increasing cloud and some northern areas will turn misty with possible fog by the end of the night.
After a pleasant end to the day, with some evening sunshine for many, it will remain fine and dry, with clear spells overnight.