A worker has been killed after a tractor apparently plunged 50ft into a quarry before bursting into flames.
Police have launched an investigation into the "serious accident" at Harden Quarry in Biddlestone, near Rothbury, Northumberland at around 10.38am on Wednesday morning.
Lafarge Tarmac, which owns the site, has declined to comment, ITV Tyne Tees report.
A Northumbria Police spokeswoman said: "The Health and Safety Executive and police are investigating a serious accident at Harden Quarry at Biddlestone, Northumberland, today."
County councillor Steven Bridgett said: