Aged between three and seven, the children were apparently playing on a dirt road on Tuesday afternoon when a tractor hit them, Captain Thulani Zwane said.
“Three died at the scene and the fourth today in hospital.”
He said the driver fled the scene after the incident. He would be charged on four counts of culpable homicide.
KwaZulu-Natal social development MEC Weziwe Thusi expressed shock and sadness over the four deaths.
“This is such a tragedy. I cannot imagine what the family is going through right now. Our thoughts and prayers are with the Magwaza family during this very difficult time,” she said in a statement.
“We hope that the police will catch the driver of the tractor who fled the scene of the incident.”
She said social workers had been dispatched to assist the family.
“This is a very traumatic incident. The family will need the assistance of professionals to deal with it,” Thusi said.
“We are also hoping the social workers will assist the broader community in dealing with what has happened.”