"There is smoke all over and paramedics are on the scene".
"All we know is shortly after take-off the plane experienced trouble and crashed".
He said the pilot was in a critical condition following the crash.
"We suspect that the plane was on its way to the Wonderboom airport", said Mahamba.
ER24 later said on its Twitter feed that one fatality had since been reported from the scene, and that it had occured "in the cockpit".
South African Civil Aviation Authority said it will issue a statement with further details on Wednesday.
The plane was marked Martin's Air Charter, but no information was immediately available about the air company.
Best Care Ambulance Services spokesperson Xander Loubser said all patients have been transported to various hospitals.