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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It will be a fine, warm and rather humid day with plenty of sunny spells.
Four raids were carried out in Wolverhampton, Coventry, Birmingham and West Bromwich
The cause was from a gas pipe damaged by a digger.