A black TV and radio host from South Africa said he had been the victim of a racially motivated attack after stopping to help a group of white people whose car had been overturned.
Samora Mangesi tweeted photos of injuries sustained in the alleged attack on Friday.
He and his two friends were called "monkeys," he said.
When they asked why they were being insulted, he was knocked unconscious.
During the alleged attack in the city of Johannesburg, Mangesi, who acts as a facilitator for SABC, said that he had facial injuries and injured himself on the side of his body after being kicked to the ground.
"Even while I was being taken to the ambulance, one of those guys tried to run over my friend with his bakkie [pick-up truck] and the paramedics had to intervene. "
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In the days after the attack, his memory was "very sporadic," he said.
"As much as they say I was awake, I can not remember being in the ambulance, arriving at the hospital or much of the treatment."
He thought about "let it go and just continue my life," but he has now reported the incident to the police, he added.
A police spokesman told the BBC that a case of alleged personal injury was being investigated.
The news of the alleged attack has provoked anger in local social media, reports the BBC's Pumza Fihlani in Johannesburg.