A plane collided with a helicopter in the English county of Buckinghamshire.
Authorities have expressed fears about the number of victims. Early reports say the pilot of the small plane and two people on the helicopter have all died.
The wreckage of the two planes landed on the ground of the Rothschild Waddesdon Manor family in Buckinghamshire.
"The aviation accident investigation department has been informed and the staff is on their way to the scene. Fire and ambulance services are also present and life-saving is a top priority. As a result of this incident, it is expected that there will be some disturbance in the road network around Waddesdon for the rest of the day. " reports announcement.
Bucks Fire and Rescue are also present, having sent seven vehicles, including search and rescue.
A resident of the area said:
"My father heard a loud bang and ran on stage. Everyone is helping the emergency services. ”
At least seven fire engines are on the scene. A firefighter searches the wreckage for survivors.