No victims have been reported.
A large fire broke out in the early hours of Thursday at a French factory in the northern port city of Rouen, local authorities said.
Authorities added there were no reported victims at this stage. The fire at the factory of Lubrizol - a company that makes specialty chemicals - had started around 0240 local time (0040 GMT).
Around 130 firefighters were currently tackling the blaze at the site, and a security cordon had been put in place.