One person is understood to have died and two others have been injured after a light aircraft crashed at Caernarfon Airport in Gwynedd.
The crash happened just before midday, when the aircraft, believed to be a Piper Cherokee normally based at Blackpool, flipped over on the runway.
A man in his 60s suffered "serious multiple lower limb injuries" and a boy had head and abdomen injuries following the incident shortly before 11:30 on Sunday.
Fire crews had been working to cut a third person from the wreckage.
The other two casualties were taken to hospital at Ysbyty Gwynedd, Bangor.
The fire service said it had 32 crew members and three officers at the airfield at Dinas Dinlle, along with eight appliances.
It added that the light aircraft had fewer than eight seats.
North Wales Police were also at the scene.
A spokesman for the Air Accident Investigation Branch said: "We are aware of the incident and have dispatched a team to carry out a preliminary inspection."