Two politicians across party and geographical boundaries have expressed horror at the magnitude of the fish kill in the River Faughan this week.
Londonderry Sinn Féin Councillor Paul Fleming said: “It’s important that a full investigation is carried out to find the source of this pollution.
“Sinn Féin is committed to the prevention of pollution of Ireland’s water systems and rivers.
“Anyone who is found to be in breach of operational standards and environmental regulation must be investigated and prosecuted.”
SDLP MLA for East Derry Gerry Mullan said: “The news that in excess of 1000 fish near Claudy have been killed is deeply disturbing, with eyewitness reports that this was like something out of a horror movie. It is certainly one of the biggest incidents of its kind this year.
“It is essential that the Northern Ireland Environment Agency and the Loughs Agency carries out an immediate investigation and determines the cause of this disaster. Causing water pollution is a criminal offence and whoever is behind this – whether through negligence or malice – must be brought before the courts.
“With no idea what is behind this at this stage, it is unclear how long it will take before the stretch of water recovers. I will be seeking a full report from the Environment Minister on this shocking situation.”