Fifty-seven people are being treated for breathing difficulties following a suspected chemical leak in Kent.
More than 40 firefighters were sent to a commercial site off Sutton Road, Langley, near Maidstone, just before 15:00 GMT.
Three ambulances, five fire engines, hazardous material officers and a specialist chemical unit are onsite.
South East Coast Ambulance Service said those affected were being treated by paramedics at the scene.
Fire crews wearing breathing apparatus and hazardous material officers are working to establish what the chemical is, Kent Fire and Rescue Service said.
It added the incident was contained to the site.
A Kent Police spokesman said the force responded to “reports of a suspected chemical leak” after being contacted by the ambulance service.
“Officers are at the scene along with the Kent Fire and Rescue Service and ambulance crews, and are offering assistance where needed.”