Fire crews say some homes near to the blaze on Sandy Industrial Estate have been evacuated. Those living on a nearby caravan park have been taken to Stourport Marina Club House.
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Two women, who were passengers in the car, suffered minor injuries and were taken to hospital for treatment.
It comes after officers last week renewed their appeal on the 20th anniversary of Michael Pritchard's death.
The OVO Energy Women's Tour race brought a £1.75 million boost to Northamptonshire's economy this summer.