Specialist teams were sent to collect samples from the river, which flows through Thetford, on Saturday with the aim of finding the source of the pollution and preventing further discharge. Please review your details and accept them to load the content

An Environment Agency spokeswoman said the source of the pollutant had been found but the foam would be allowed to reduce naturally as it was diluted by the rain.

She said: “This incident is a live investigation, and the pollutant is an unknown substance.

“We have detected the source and expect the foaming to reduce naturally as it is diluted by the rain that will increase the flow of the river over the next few days.

“Our officers have seen small dead fish and fry; this is obviously upsetting. We will survey the impacts once the pollut

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