Valve leaked nearly four hours before the fire.
Agency provides time table of event leading to the fire.
Five firefighter treated for heat exhaustion.
Production capacity reduced by an estimated 50,000 metric tons.
Company manufactures nitrocellulose, also known as guncotton.
Towering black smoke rises near the Guarulhos International Airport.
More than 10 fire trucks immediately dispatched to the scene.
Authorities have requested mutual aid from surrounding communities.
Plant owned by a leading agrochemicals manufacturer in the country.
No injuries were reported in the warehouse blaze.
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