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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An engineer has been confirmed dead in the crash in Wales. The RAF say the pilot survived and is receiving treatment.
A Red Arrows jet has crashed after an incident at RAF Valley in north Wales, the Ministry of Defence has said.
It has been confirmed that the Red Arrows pilot survived the crash but unfortunately, the passenger, an RAF engineer, died.