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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A cloudier day across the Midlands.
A 72-year-old man is in police custody after a 60-year-old woman was found dead at a house in Hinckley last night.
Jimmy Floyd Hasselbaink's side have secured promotion to League One after their 2-1 win at Morecambe.