Environment experts are investigating after fish were found floating dead on the River Yare on the outskirts of Norwich.

Officers from the Environment Agency were called to the scene in Cringleford where oxygen levels are suspected to have dropped due to hot weather.

Environmental boffins arrived at the site in the early hours of Tuesday and began using aeration equipment to increase oxygen levels in the river which is still ongoing.

It is not known how many fish have died as the incident is still being investigated.

When the site was visited on Thursday morning, officials said dissolved oxygen levels at the site both upstream and downstream were now "within the healthy ranges expected".

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Norwich Evening News: The scene at the River Yare in Cringleford on TuesdayThe scene at the River Yare in Cringleford on Tuesday (Image: Environment Agency)

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An Environment Agency (EA) spokesman said: "The water is running clear and there are no further signs of fish in distress or pollution in the watercourse.

"We will now be removing our aeration equipment.

"We suspect that this was a natural incident caused by the recent weather conditions."

There have been reports of similar incidents around the country in recent weeks.

EA officials say anyone who spots fish in distress should call the 24-hour emergency number 0800 807060.