A helicopter has crashed in east Yorkshire, resulting in five casualties, police have said.
The injuries are described as "serious" but are not believed to be life threatening.
The incident occurred at Breighton Aerodrome, south of York.
Two people were taken by air ambulance to hospital, police said, one to Leeds General Hospital and another to the Hull Royal Infirmary.
The other injured people were taken to hospital by ambulance.
Numerous emergency services were in attendance, after the accident was reported just after 6pm on Sunday evening.
The casualties were all male and had suffered various head, back, chest and leg injuries. They were all out of the aircraft when rescue workers from the North Yorkshire Fire Service arrived, a spokesman said.
The Yorkshire Air Ambulance Service said both its helicopters were sent to the crash site.
The Air Accident Investigation Branch will be leading the investigation to establish what caused the crash, according to Humberside Police.
Breighton Aerodome is a former Second World War heavy bomber base and cold-war nuclear missile launch site.
It is now the home of the Real Aeroplane Company, a collection of classic planes, and the Real Aeroplane Club, whose members own and operate many unusual aircraft.
