Fresh fears have emerged over contamination of the River Great Ouse near Huntingdon after walkers captured footage of the water turning bright blue.

A myserious green substance was seen floating in the waterways a few weeks ago. Picture: CONTRIBUTED.A myserious green substance was seen floating in the waterways a few weeks ago. Picture: CONTRIBUTED.

The Hunts Post reported earlier this month how dog walkers had reported their pets falling ill after swimming in a stream that runs through the riverside park between Hartford and the River Great Ouse.

Pictures emerged of the water running emerald green, while there have also been reports of foaming and of diesel in the water.

Despite investigations being launched by Anglian Water and the Environment Agency, however, fresh footage emerged this week of the water running bright blue, raising fears over pollution and harm to local wildlife.

A walker who visited the area this week captured footage of the stream, which feeds into the River Great Ouse.

She told The Hunts Post: "I've tried to contact the Environment Agency but the incident is happening again and again. Apparently the river has been in this state for weeks and there were numerous reports from local people about dogs being poisoned.

"This stream falls into the river where cattle drink their water, and just steps away, swans, fish and other habitats are also getting poisoned."

It is understood that investigators have been checking industrial areas around Huntingdon for clues as to the source of the incidents.

A spokesman for Anglian Water said: "We are working closely with the Environment Agency to identify the source of the blue and green coloured water.

"We would always encourage customers to report any suspicious substances to us so we can investigate as soon as possible. We can be reached 24 hours a day, seven days a week by calling 08457 145 145."

An environment Agency spokesman said: "We are aware of the pollution incident on the River Ouse and are working with Anglian Water to identify the source.

"The river catchment covers a large area and there are numerous places where the coloured effluent could have come from.

"If people see the river change colour we would urge them to report it to our incident hotline on 0800 80 70 60 stating their location. This will help us in our investigations."