A Warburtons factory caught on fire last Thursday night, which took almost four hours to extinguish.
The fire at the Manchester factory site on Glebe Street, started in the plant room, located at the top of the building, in the motor of a piece of machinery which pushes flour into the production line.
Two fire engines and an aerial appliance from Oldham attended the incident at 8.45pm, using hoses and specialist equipment, including a thermal imaging camera, to put out the flames.
A spokesman for Warburtons, said: "All employees were evacuated safely and the fire was quickly contained by the fire brigade."
The company said it would be working with the fire brigade to investigate the cause of the fire.