"The fire continues at the Lubrizol facility in Rouen, rescue service on-site", the prefecture wrote on Twitter.
According to the Parisien newspaper, about 130 firefighters rushed to the site to extinguish the fire. The factory belongs to the SEVESO category, meaning that it is under the authorities' special supervision due to the presence of potentially hazardous chemicals.
At the moment, there is no official information about the casualties.
The Lubrizol produces chemicals for the transportation, industrial and consumer markets.