A fire broke out a Brandneu Foods in Cobourg Saturday morning (July 8).
A passerby who was out walking her dog noticed some heavy smoke billowing from the building and contacted emergency services.
Cobourg fire and police arrived on scene to a major fire underway.
Fire fighters say the sprinkler system was working but there was a significant amount of cardboard burning inside the warehouse.
Fire crews from nearby Baltimore and Port Hope fire departments were also called in to help battle the blaze.