Firefighters from across Lancashire were called to the bread factory on Billington Road at 2.45pm on Monday.
12 fire engines and two aerial ladder platforms were then dispatched to the area.
Providing an update this evening a spokesperson for Warburtons said that the fire has been since been contained to one side of the building and that production has stopped. You can read their full statement here
A spokesperson for Lancashire Police confirmed that the fire was not thought to be suspicious.
The cause of the blaze is under investigation and the extent of damage to the building is not yet known.
Take a look at the devastating aftermath of the fire ravaged building.
1. Devastating pics show aftermath of fire ravaged Warburtons factory
An exhausted firefighter at the Warburtons factory in Burnley Photo: Chorley Fire Station
2. Devastating pics show aftermath of fire ravaged Warburtons factory
Firefighters from across Lancashire were called to the bread factory on Billington Road in Burnley at 2.45pm on Monday. Photo: Chorley Fire Station
3. Devastating pics show aftermath of fire ravaged Warburtons factory
When the site is safe, a full investigation will take place to determine the cause, and to assess the full extent of the damage. Photo: Chorley Fire Station
4. Devastating pics show aftermath of fire ravaged Warburtons factory
Firefighters hard at work Photo: Chorley Fire Station