A significant number of fish have been killed and bathers urged to stay away from the water following a pollution incident on a stretch of the Par River today.
Cornwall Council have issued the warning and the Environment Agency are currently investigating the incident at Pont's Mill but as yet the exact source of the pollution is unknown.
A spokesperson for Cornwall Council said: “There is a risk that the pollution incident will be affecting the bathing water quality and as a precaution members of the public are being advised not to enter the water.
“It is unlikely that the Environment Agency will be in a position to know whether the warnings can be removed until at least Monday. This incident is not believed to be associated with the sewage treatment works.”