Hundreds of Par River fish killed by pollutant
The number of fish killed by a pollutant in a four-mile (7km) stretch of the River Par in Cornwall has risen to "several hundred", according to the Environment Agency.
A spokesperson for the agency said work was continuing to find the source of the pollution.
Brown trout, eels and flounders are among the fish killed, the agency said.
Cornwall Council has advised people not to enter the water and said the warning could remain in force for several days.
The stretch affected is between Luxulyan and Par Beach, the Environment Agency said.
Cornwall Council said the incident was not believed to be associated with the sewage treatment works.