Two drivers died in a "drag race crash" on the N2 north near Durban's Gateway on Saturday.
Police and paramedics at the crash site said that it appeared that that the driver of a Porsche was racing against an Audi when he crashed into a Mercedes-Benz.
The Porsche driver died on the scene and the Mercedes-Benz driver died in hospital later the same night. The driver of the red Audi reportedly fled the scene.
ER24 spokesman Derrick Banks said paramedics arrived at the crash scene to find a man in his 30s still trapped in his car.
"The driver, suffering severe body trauma, had to be incubated to help him breathe," Banks said.
"But due to the injuries he received he was declared dead a few moments later."
Banks said though the cause of the accident was still unclear it was believed that the driver of the Porsche crashed after losing control - smashing into the Mercedes, and careening into a barrier and then overturning several times before coming to a halt.
"A red Audi was also involved and went down the embankment," Banks said. "Members of public searched for it but were unable to immediately find it."
Police spokesman Superintendent Muzi Mngomezulu said at this stage they could not identify the two deceased.
"We do not yet know the names of the dead drivers but believe they are from the Durban area," Mngomezulu said.
"We are also still unsure whether it was a drag race or not that resulted in the accident."
The police said they were investigating two cases of culpable homicide.