Fire crews are this morning still on the scene of a blaze at a waste management business in Thurlton, near Loddon.
They were first called to the scene, at M Gaze and Co Ltd, in Thurlton Road, at 8.09 last night.
And while nobody was injured in the fire, a roof at the site has collapsed, making it difficult for crews to reach the remaining pockets of fire.
A spokesman for Norfolk Fire Service said crews were likely to be at the scene for the rest of the day.
Last night, the service had advised people in Thurlton to keep doors and windows shut as a precaution, but this is now no longer necessary.
Norfolk Fire and Rescue Service sent fire engines and water carriers from across the east, south and west of the county, who were joined by firefighters from Suffolk.
Police, the Environment Agency and UK Power Networks were also at the scene, and a fire investigation officer is today working on the site to try and establish what caused the blaze.
Incident commander Richard Herrell said the fire was in a 80x50m hangar with 1,500 tonnes of compost and food waste.
His said his main concern was with the smoke plume, which could be seen from miles around, and which he said was being monitored. He said that, at the time, it was smoke from compost waste, although it was believed some plastics were also in there.
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