An investigation is under way after 3,000 tonnes of wood was destroyed in a blaze at a Teesside recycling plant which began more than 24 hours ago.
Firefighters were called out shortly before 0600 GMT on Monday to the Jigsaw Wood Recycling Plant at Haverton Hill, near Middlesbrough.
Nearby roads were affected by smoke and at one point police advised nearby residents to stay in their homes.
No-one was hurt and fire chiefs said the blaze was now under control.
A joint police and fire service investigation is under way in an effort to discover the cause of the incident.