Fire fighters used breathing apparatus to tackle a factory fire at Lamb Weston Meijer in Wisbech on Saturday morning.
Four fire crews - one from Wisbech, two from March and one from Long Sutton - were called to the fire in Weasenham Lane at 11.40am.
On arrival, firefighters found a well developed fire in the main factory, measuring approximately 130m by 70m.
A hose reel and yet were used to extinguish the fire, and firefighters checked the area using a thermal imaging camera before returning to their stations by 3.50pm.
The cause of the fire was accidental.
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