The source of pollution which turned the River Ebbw a white colour has been restored, according to Natural Resources Wales.
After receiving several reports of discolouration of the river’s water near Newbridge last week, the environmental body confirmed that it had discovered the source of the pollution and had returned the water flow to normal.
Due to an ongoing investigation, NRW has said that it is unable to disclose the source of the pollution, but is continuing to assess the impact of the pollution on river life.
No fish are believed to have been harmed as a result of the incident.
Jacob Birch, Natural Resource Manager for NRW, said: “Over two miles of the River Ebbw down stream of Crumlin were found to be significantly discoloured by this incident.
“We identified the source and have put a stop to any further pollution, the discolouration however will take some time to fully clear.
“We have been able to respond rapidly to this incident thanks to calls from members of the public to our incident hotline on 03000 65 3000.”