Police have urged the community of Umlazi township, south of Durban, to work with them and report any criminal activities rather than take the law into their own hands.
This comes after three people were stoned to death in the township within two days in what is believed to be vigilante killings.
Two men were stoned to death at an informal settlement in Q Section on Monday night.
The body of Khanyisile Dladla was found in E Section of the same township earlier on Saturday. She had also been stoned to death.
Police spokesman Captain Khephu Ndlovu said the two men, aged 22 and 25, were suspected of having been involved in criminal activities. Their identities were unknown.
"The men had been stabbed and severely assaulted and there had been attempts to burn one of them with a tyre," Ndlovu said.
"It looks as if the community took the law into its own hands, which is something we condemn.
"We strongly condemn vigilantism because the police have never failed to fight crime."
He could not say whether the victims were locals or outsiders.
An Umlazi resident, who refused to be named for fear of his life, said the community was sick and tired of crime.
He said in M and K sections residents were being terrorised by a convict known only as Shiko, who was released from prison two weeks ago.
"This guy is a menace to society," the informant said.
"Since his release we have become scared of walking around the township - especially at night.
"He robs and shoots without apparent provocation.
"Under the circumstances you can't blame the community for looking out for themselves and taking the law into its own hands."