Firefighters are continuing to tackle a large fire in North Yorkshire at a site believed to contain chemicals.
Crews were called to BCB Environmental Management Ltd, Marston Moor Business Park, Tockwith, at about 0400 BST.
The fire service said it was working to confirm what, if any, chemicals were involved.
Roads around the area have been closed off by police and residents living nearby have been asked to keep their windows and doors shut.
A spokeswoman for North Yorkshire Fire and Rescue Service said the fire was "extremely big" and was contained to the main warehouse of the building.
At its height nearly 30 firefighters, five engines and the aerial ladder platform were at the scene.
This has now been scaled down, with 13 firefighters, two appliances and the aerial ladder remaining on site.
Environment Agency officers are also on site and working with the fire service to minimise any impact to the Fleet Beck stream, which flows past the site.
A police spokesman said: "From the fire chief, his advice to local residents is keep doors and windows closed, and all animals inside."
A spokesman for BCB said no-one had been injured and there was currently no indication how the fire started.