A mystery substance has turned a tributary of a river in England's West Country bright blue.
Tests are currently underway after the River Frome in Somerset turned a luminous blue colour. The UK's Environment Agency says a suspected "pollution incident" might be the cause.
- West Auckland's Whau River 'severely' polluted with white substance
- Government invests $12m to clean up waterways
- Special report: how polluted are New Zealand's rivers?
The agency says there have been no reports of dead wildlife so far.
Results from the test samples are expected on Monday (local time) and the stream will be monitored over the weekend.
The River Frome's alleged pollution comes a month after the Environment Agency claimed serious pollution incidents in England increased in 2018, "causing damage to the rivers and wildlife".
A report by the agency, released on July 10, issued a stern warning to water companies "to clean up their act and protect the environment from pollution".
The report described the efforts made by UK water companies to protect the environment as "simply unacceptable", with just 1 percent of major water and sewage companies in England performing at a satisfactory level.