South African Paralympic athlete Oscar Pistorius is being questioned over the fatal shooting of his girlfriend at his home in Pretoria, local media say.

Police captain Sarah Mcira told local media that a woman - who died at the scene - was shot in the head and arm.

The precise circumstances surrounding the incident are unclear. Reports say he may have mistaken her for a burglar.

The 26-year-old was the first double amputee to run in the Olympics.

South Africa has among the highest rates of crime in the world and many residents keep weapons to protect themselves against intruders.