Fifteen fire engines are battling a large blaze at a recycling plant.
Crews were called to a severe blaze at Lawrence Recycling in Stourport Road, Kidderminster, West Mercia Police said.
A force spokeswoman said firefighters expect to be there for "several days" as they try to get the blaze under control.
There has been no need to evacuate local residents but emergency services have advised people to keep all doors and windows closed due to the large amount of smoke in the area.
A number of road closures are also in place.