"Our medical services are currently on the scene. They've been treating the patients," Russel Meiring, a spokesperson for emergency service provider ER24, told Xinhua news agency.
ER24 will move the treated patients to nearby hospitals, he said.
Details of the cause of the crash on Tuesday are yet to be established, but authorities confirmed that the plane hit a factory building before crashing.
South African news outlet ENCA quoted an eyewitness saying: "I just saw something dropping down from the sky, but I didn't know what it was, and the next thing I saw was an explosion and a big bang."
The charted aircraft, Convair 340, belongs to the Dutch airline Martinair. It crashed shortly after take off from Wonderboom airport.
South African Civil Aviation Authority said it will issue a statement with further details on Wednesday.Nineteen people were injured when a vintage plane crashed on Tuesday after it took off on a test flight from a small airport in the South African capital Pretoria, emergency services said.
The Convair plane built in 1954 was due to soon be flown to the Aviodrome air museum, near the central Dutch city of Lelystad, after reportedly being renovated at the small Wonderboom airport in Pretoria.
Images from the site showed the plane broken into several pieces as paramedics helped survivors out of the aircraft and treated patients at the scene as firefighters tackled the smoking wreckage.
“Medics from ER24 and other services are at the scene of a plane crash at Wonderboom in Pretoria,” Russell Meiring, spokesperson for the ER24 medical service, said.
“We have 19 injured casualties ranging from minor to critical injuries at this stage and no confirmed fatalities.”
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 said the Convair was a US-built passenger plane that could carry 44 people.
It had been due to fly to Aviodrome via east Africa, through Egypt, Croatia, Austria to the Netherlands.
The plane was marked Martin’s Air Charter, but no information was immediately available about the air company.
Jurgen Kotze, chief operating officer for Emer-G-Med services, said the crash was near Wonderboom airport on the Moloto Road.
“They are busy treating one of the pilots … and he will be airlifted to a Netcare hospital,” he said.
“Some patients have been transferred already and some of them are still on scene.”
South African Civil Aviation Authority spokesperson Kabelo Ledwaba said its investigators were at the scene and would issue a statement.
