Emergency Services and law enforcement agencies have responded after around eight buses were torched in Eldorado Park, south of Johannesburg.
Johannesburg EMS spokesperson Robert Mulaudzi said firefighters had responded to the incident at around 10:00 on Monday morning.
Read: Western Cape taxi strike expected on Monday
Mulaudzi said the buses had been "completely destroyed".
No injuries were reported.
He said the cause of the fires was still being investigated.
Earlier on Monday morning, at least three buses were also set alight in Khayelitsha in the Western Cape.
It was not immediately clear what the reason for the arson was or whether it was linked to the Western Cape taxi strike.