Action taken as mystery grey sludge suspected of killing plants invades towpath near Leeds Dock

A mystery paint-like substance has invaded a riverside footpath between Leeds Dock and Thwaite Watermill on several occasions since the end of last year. The picturesque path is popular with runners and cyclists and forms part of the Trans Pennine Trail.

Green Party Coun Ed Carlisle said last week that the situation was “maddening” for residents, with the substance thought to have killed off plants and greenery in the area. On Wednesday, Leeds City Council said those responsible have now sealed the pipes which were believed to have been the source of the leak. The pipes sit on private land belonging to GB Railfreight, who confirmed work to stop the discharge was “underway”.