Dozens of workers were evacuated from a Weetabix factory on Thursday when fire broke out in an industrial oven.
Around 40 firefighters were sent to tackle the blaze at the premises in Station Road, Burton Latimer, near Kettering, Northamptonshire.
A fire service spokesman said workers were safely evacuated and no injuries were reported in the fire which began at about 1800 BST.
The plant at the company's headquarters is staffed round the clock.