Specialist teams are working to recover a coach that plunged down a steep embankment, leaving one person dead and three critically ill.
Crews from Staffordshire Fire and Rescue Service, Staffordshire Police's Collision Investigation Unit and vehicle examiners from the Vehicle and Operator Services Agency (VOSA) have been working at the scene in Alton, Staffordshire.
Forensic officers have been examining the scene and a senior investigating officer from Staffordshire Police's Major Investigation Department has been appointed.
The coach, from Peterborough, Cambridgeshire, was carrying 70 farm workers home from a day out at Alton Towers theme park when it crashed in Station Road, near Alton villageon Monday night.
Police said it collided with two stationary vehicles and smashed through a wall before falling 10 to 15 feet down an embankment.
It eventually came to a stop on its side, in a resident's garden, where it trapped another vehicle underneath it.
The coach driver, from Lincolnshire, suffered significant leg injuries and is one of three people who remain in a critical condition, police confirmed.
Twenty-one people were taken to local hospitals in Stoke-on-Trent, Stafford, Burton and Selly Oak, Birmingham, and dozens more sustained minor injuries.
Two of the injured were airlifted to hospital and paramedics treated "walking wounded" at the medical centre at Alton Towers.
Police said they were "open-minded" about the cause of the crash and an investigation could take days.
