Former South African athlete Oscar Pistorius has been hurt in a prison brawl, less than two weeks after his sentence for the killing of girlfriend Reeva Steenkamp was more than doubled.

A prison department spokesman Singabakho Nxumalo said the disgraced paralympian was allegedly involved in a fight over the use of a public phone.

Nxumalo said Pistorius, who was jailed for 13 years and five months, only sustained a bruise and there were no serious injuries.

The six-time Paralympic gold medallist had made history by becoming the first amputee sprinter to compete at the Olympics in 2012 in London, running on prosthetic blades.