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Natural Resources Wales is remaining tight-lipped over its investigation into three separate pollution incidents in the Nant yr Aber river.

Nearly seven months have now passed since the first incident was reported to the governmental body.

On August 30, a section of the river turned white and murky, killing more than 100 fish – including trout, salmon, grayling and bullheads.

On September 2, NRW said its officers were at the river to continue the investigation and confirmed the pollution had “ceased”.

In a statement at the time, 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.”

However, on September 16, around 800 metres of the river, near the Asda store in Caerphilly, was affected with what was described by Morgan Jones ward councillor Shayne Cook as a “milky substance sitting on top of the water”.

A further case of discolouration was reported on Wednesday, October 19.

Natural Resources Wales (NRW) said the three incidents were unrelated.

A spokesperson for NRW told Caerphilly Observer its investigation was progressing, but was unable to share any details due to “internal processes”.

The spokesperson was also unable to give a timeframe for when the investigation would be complete or when more details could be made public.