Olympian and Paralympian Oscar Pistorius, in jail for murdering his girlfriend, has been bruised in an altercation with another inmate over telephone use.

Pistorius sustained a minor injury in an alleged assault at the Atteridgeville Correctional Centre last week, Singabakho Nxumalo of the Department of Correctional Services said on Tuesday.

Pistorius had a medical check-up and the incident is being investigated.

South Africa’s Oscar Pistorius (David Davies/PA)

Pistorius, a double amputee runner who won worldwide acclaim winning in the Paralympics and competing in the Olympics, is serving a 13-year sentence for the murder of his girlfriend Reeva Steenkamp.

Pistorius shot her dead in his home on Valentine’s Day 2013 and claimed he thought she was an intruder.