Carcinogenic chemical material is said to be stored at the Chemie-Pack plant The southern Netherlands is on its highest state of alert after a blaze at a chemical plant near Rotterdam sent out a thick cloud of smoke.
The cloud from the fire at Moerdijk was floating north and had reached the city of Dordrecht, Dutch media said.
Some 400,000 litres of carcinogenic material are stored at the Chemie-Pack plant, De Telegraaf says.
There were no reports of casualties and local officials said it was unclear if toxic fumes had been released.
Troops were helping to tackle the flames, said to be many metres high.
Residents in Dordrecht were being warned to keep windows and doors shut.
Chemie-Pack, which is about 40km (25m) south of the port of Rotterdam, processes and packs products for the chemical industry, the company says on its website.
A Shell refinery in the Moerdijk industrial zone was not affected by the fire, a spokesman told Reuters news agency.
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