Mick Birch, a Group Commander at the West Midlands Fire Service, says it's too early to say how the fire started but a member of staff at the timber warehouse did say where he thought the blaze began.
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A prison officer was taken to hospital with minor injuries following a riot at HMP Hewell.
Thousands of people turned up at Wollaton Park yesterday for the festival, which was headlined by Kaiser Chiefs.
Specially-trained prison security teams were sent to HMP Hewell near Redditch, after trouble broke out on one of the prison's wings.