Residents of a sleepy village are worried that toxic chemical waste is leaking through a forest where children play.
The Ty Llwyd Quarry in the Welsh village of Ynysddu, near Caerphilly, is believed to contain highly carcinogenic PCBs and other pollutants dumped at the site decades ago by chemical company Monsanto from a nearby factory.
Manufacture of PCBs - which used to be used in electric equipment - was banned in the UK in 1981 after they were shown to be deadly to humans and wildlife.