Four teenagers have been seriously injured in a collision between two carriages on The Smiler roller coaster at Alton Towers.
A West Midlands Ambulance Service spokeswoman said: "Four teenagers, two males and two females, suffered serious leg injuries in the incident and are receiving treatment as we speak.
"The other twelve occupants of the ride are not thought to be seriously injured. We still have a number of resources at the scene."
The four teens will be airlifted to trauma centre at University Hospital Coventry and Warwickshire and Royal Stoke University Hospital for further emergency treatment.
The West Midlands Ambulance Service said that it couldn't confirm reports that one person had died.
The boyfriend of a teenager who had her leg amputated after a rollercoaster crash says the theme park should have shut down the ride.
Details of the rides that have been halted and what to do if you have tickets for Alton Towers.
A man who witnessed the rollercoaster crash at Alton Towers told ITV News he raised concerns about a carriage on the track but was ignored.