A helicopter and another aircraft have crashed in mid-air over Buckinghamshire, The Independent reported.
The Air Accidents Investigation Bureau said it was investigating a “mid-air collision involving an aircraft and a helicopter near Aylesbury” while police said preservation of life was their top priority.
The aircraft involved was “small”, The Independent understands. Both craft came from Wycombe Air Park, near High Wycombe.
It happened near the historic Waddesdon Manor estate and several people are feared dead, according to reports.
Smoke could be seen rising over the crash site near Waddesdon Hill, according to local media.
The Thames Valley air ambulance has been called.