Four people have died following a mid-air collision between a helicopter and a two-seater plane in Buckinghamshire, England, according to Thames Valley Police.
Both of the aircraft are understood to have come from Wycombe Air Park and collided near Waddesdon, Buckinghamshire, shortly after midday.
Superintendent Rebecca Mears of Thames Valley said the aircraft were carrying two people each.
She said she could not give any details of the identity or the genders of the victims at this stage and her "first priority" at this stage was the next of kin.
Police said it was "too early to tell" what might have caused the crash.
Air crash investigators were called to the crash site. They were joined in the dense woodland by paramedics, firefighters and Thames Valley Police.
The airfield offers flight training. Many roads were closed off around the site of the collision.
A Notice to Airmen was previously issued to warn pilots the airfield's air traffic control services would be closed during three 30-minute periods on selected days between 7-30 November due to a "staff shortage".
The crash occurred around half an hour after the latest closure was due to end.
The plane involved is a Cessna 152 with a capacity for one pilot and one passenger.
