27 January 2012 Last updated at 12:43 ET

Dead fish found in stream off River Usk near Brecon

More than 100 fish were found dead in a stream off the River Usk

An investigation is under way after more than 100 fish were found dead in a stream off the River Usk in Powys.

Environment Agency Wales made the discovery at around 13:30 GMT on Friday.

The fish and a large amount of silt were found in the stream, about a mile from Brecon, and officers are trying to establish the cause of death.

Anyone with information is being urged to contact the Environment Agency's incident hotline on 0800 807060.