Cricket Australia is investigating after CCTV footage emerged of an altercation between David Warner and Quinton de Kock on the steps leading into the dressing rooms at Kingsmead in Durban.
The footage, first aired by South African outlet Independent Media, shows Warner being moved away from the incident by team-mates, including captain Steven Smith, after walking up the steps during the tea interval on the fourth day.
In the video, Warner's anger is directed at de Kock who is following the Australians up the steps. At the start of the clip, the Australian players first up the stairs are seen peering back over the handrails then Warner emerges round the corner and is already involved in a heated exchange.
He has ushered up the steps by Usman Khawaja but does not immediately enter the away dressing room, even though Tim Paine also urges him to move go inside. Smith then drags his vice-captain away as de Kock squeezes past into his dressing room.
There was no indication from the footage what started the incident.
Shortly after the footage emerged, a Cricket Australia statement said: "CA is aware of reports of an incident between players in Durban. CA is working to establish the facts of what occurred and will not be commenting until this has been done."
South Africa team manager Mohammed Moosajee said: "It's rather unfortunate that the incident took place and certainly not in the spirit of the game. The match referee has spoken to us after the day's play. We will await any further communication from the ICC around this incident."