A large volume of foam that mysteriously appeared on a river is being investigated by the Environmental Agency.

Images shared by the agency on Saturday morning showed the foam covering an area of the River Thet, in Thetford.

A spokesperson said the source had been detected and further discharge stopped.

But the cause is not yet known and an investigation is underway.

An Environment Agency spokesperson said on Saturday: "The foam is continuing to travel down the river and is visible...

"Our fisheries officers are attending site, and we would appreciate members of the public reporting any fish in distress."

An Anglian Water spokeswoman said the foam had been caused by a "third party" and was not from any of "our equipment or assets in the area", it has been reported.

She said: "One of

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