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The cause of the pollution which killed more than 100 fish and left a stretch of the Nant yr Aber river white and murky has been discovered.

However, Natural Resources Wales (NRW) has said it will not announce the cause until its investigation is finished.

Trout, salmon, grayling and bullheads were among the fish killed, following reports of contamination in the river on Tuesday, August 30.

NRW said its officers were at the river on Friday, September 2 to continue the investigation and has confirmed the pollution has now “ceased”.

In a statement, NRW said: “Officers have been able to identify the cause of the pollution and are investigating to determine the root cause.

“A full biological and fisheries assessment has now been completed.”

Water samples taken from the river will be analysed at a lab in Swansea, with the findings set to determine what course of action NRW will take, including potential enforcement action against those responsible.

Councillor Shayne Cook, who represents the Morgan Jones ward where the pollution was found, said he was “shocked” by it and said: “The knock-on effects to the ecosystem in that area will be felt for some time.

To report further signs of pollution in the river, Natural Resources Wales can be contacted online at through its 24-hour incident communications line on 0300 065 3000.