Fire crews from Odsal and Bradford tackled a blaze at an engineering works last night.
More than 100 metres of ventilation ducting overheated, sparking off the fire at Rigby's on the Park House Industrial Estate, Low Moor, just after 10pm.
Nightshift workers were evacuated from the single-storey building.
It took fire crews two and a half hours to make the works safe again.
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