One of South Africa’s best known TV journalists has been mugged on camera as he waited to go on air.

Footage shows two men accosting Vuyo Mvoko, from the national broadcaster SABC, who was outside a Johannesburg hospital to report on the arrival of Zambia’s president for medical tests.

Mr Mvoko later said one of the muggers threatened him with a gun when he did not want to give up his mobile phone.

The robbers appear unconcerned by the presence of the camera.