A river preservation group is calling for legal action against those responsible for thick white foam pollution for the second time in a year.
The substance filled a stretch of the River Thet in Thetford, Norfolk, on Saturday – and dead fish could be seen.
Roseanne Gough of the Thetford River Group – which carries out monitoring of the waterway, including litter trawls and water quality testing – said the latest incident was “devastating for the community and the wildlife as well”.
The river is a chalk stream, and such waterways are globally rare, with almost a third of the world’s chalk streams found in the East of England.