A plane crash outside the South African capital of Pretoria has injured 20 people, with at least one in critical condition, according to local emergency services.
This happened shortly after the global chartered aircraft had taken off, said local CPF chairman Vernon Smith.
Emer-G-Med Chief Operating Officer Jurgen Kotze said the four critically injured patients were still entrapped in the aircraft.
The Convair-340 plane built in 1954 was due to soon be flown to the Aviodrome air museum in the Netherlands from Wonderboom airport in Pretoria.
The Aviodrome aerospace theme park in the Netherlands said on its Facebook page that it was "hugely shocked" by the crash.
The plane, which had been expected at the Aviodrome, "crashed in South Africa during take-off on a test flight", it said.
It was unclear how many people were on board the plane when it went down.
Paramedic Xander Loubser from BestCare Ambulance Service confirmed the crash happened about 1km east of the N4 in Derdepoort and about 8km east of the Wonderboom Airport.
The fuselage was marked Martin's Air Charter.
According to Loubser several patients have been airlifted to nearby hospitals.
The Civil Aviation Authority says it has dispatched its investigators to the plane crash site.