Evidence on the scene suggested the three had suffered a brutal killing.
Mojapelo said police found stones on the scene, which suggested the three were stoned and assaulted before they were set alight.
Limpopo police commissioner Lt-Gen Nneke Ledwaba condemned the incident.
Police were investigating three counts of murder.
“The motive behind this brutal killing is still subject to police investigations, but mob justice cannot be ruled out,” said Mojapelo.
He called on anyone with information about the incident to come forward.