The blaze is raging at two warehouses in the Rothenburgsort quarter of Hamburg, German newspaper reported. Local residents were alerted to the danger of "smoke gases and chemical components in the air" and were instructed to close windows and doors, as well as turn off ventilation and air conditioning.
An official warning classified the fire and smoke as "extreme danger," the newspaper said.
The German TV broadcaster reported that hydrogen sulfide was believed to be leaking on the site.