- West Country
- 2 updates
The Environment Agency and Thames Water are investigating the sewer network to see where the pesticide entered the system, in an attempt to identify those responsible.
The campaign group Action for the River Kennet says the waterway is continuing to decline, ten days after it was polluted.
Public Health England and the Food Standards Agency have said it is safe to enter the water and eat fish caught there but the campaigners say the river is deteriorating.
Dead crayfish have been found and brown algae is spreading, killing river plants and reducing food sources for fish.
People are being warned to stay out of a stretch of water that's been polluted. The Environment Agency say they're trying to find out the exact cause of the pollution in the River Kennet between Marlborough and Hungerford.
There's also a warning not to eat any fish caught in that part of the river. Our environment correspondent Duncan Sleightholme reports from Axford in Wiltshire.