The Environment Agency has launched an investigation into a site in Clenchwarton where firefighters battled a huge blaze.
Crews from across Norfolk attended the fire on Main Road, with plumes of smoke reported as being seen as far away as Skegness in Lincolnshire, and residents were urged to stay indoors and shut their windows.
Last Friday’s fire was reported at 4.35pm and crews attended from Terrington, King’s Lynn North and South, Wisbech, Downham Market, Outwell, Swaffham, Heacham, Hunstanton, Methwold, Hingham, Holt and West Walton, along with the water carrier from Fakenham, a drone from Wymondham and Sandringham control unit.
Firefighters left the scene at around 7.30am the following day.
An Environment Agency spokesperson said: “We are investigating concerns about a waste site in Clenchwarton near King’s Lynn.
“If anyone has any more information about the site that could help our enquiries, they can contact our incident hotline on 0800 80 70 60.”
A spokesman for the Norfolk Fire and Rescue Service said there would not be a fire investigation as the cause of the fire was a deliberate managed burning which got out of control.