This is the best summary I could come up with:
Crews arrived at the scene about 11:20am, and are working to bring the blaze under control using specialist appliances and aerial equipment.
Near the scene, the ABC saw a charred barrel flying into the air from the fire, and landing a few hundred metres away.
Anyone in areas affected by the thick black smoke has been urged to take shelter indoors immediately, and close all exterior windows, doors and vents.
The ABC understands the fire is at the site of the ACB Group factory, where a worker died in a chemical explosion last year.
Victoria Police said there had been no reports of injuries and it was believed everyone inside the factory had been evacuated safely.
The local community has been urged to avoid the area to let emergency services do their job, and motorists have been warned not to stop on high speed roads to watch the fires.
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