National commissioner of police Khehla Sitole said the men were travelling back to Johannesburg from a colleague's funeral on Saturday night when they were ambushed.
"Preliminary reports indicate that that the 11 were among 17 people coming from a funeral... Four victims were critically injured and taken to hospital while two survived unscathed," he said.
Police launched a manhunt to find those responsible.
"We will await for the investigation to advance before speculating on a motive," said Sitole.
Private minibuses provide essential transport for millions of South Africans, but violence is common between rival taxi groups as profitable routes are hotly contested. DM
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