Four feared killed as plane & helicopter collide mid-air

Four people have died after a plane and a helicopter crashed in mid-air over Buckinghamshire.

Two people were killed in each aircraft, Thames Valley Police said.

Police and the Air Accidents Investigation Branch (AAIB) said they have launched a joint investigation to establish the cause of the collision just after midday at Waddesdon Estate, near Aylesbury.

A Wycombe Air Park spokesman said both aircraft came from the airfield.