Oscar Pistorius arrested after girlfriend's shooting PARALYMPIC star Oscar Pistorius has been arrested over the fatal shooting of his girlfriend at his home in Pretoria, according to local media reports. Early reports say Pistorius may have mistaken partner for intruder Police in the country have told local media that Reeva Steenkamp, the woman believed to be Pistorius's girlfriend, was shot in the head and arm at his home in Pretoria. The circumstances surrounding the incident are unclear. Reports say that he may have mistaken her for a burglar. Pistorius, 26, was the first double amputee to run in the Olympics. The incident is said to have happened at 4am today. Pistorius has been arrested and questioned by South African police, reports say. Kribani Pillay, from Johannesburg's Talk Radio 702, told Sky that police had arrested a 26-year-old man believed to be Pistorius on suspicion of murder. She said Pistorius told police that he thought the woman was an intruder. She confirmed that there was speculation the shooting may have been a Valentine's Day surprise gone wrong. Miss Pillay said the area around Pistorius" home was "teeming" with emergency services, media and onlookers. Girlfriend Reeva Steenkamp was active on Twitter just 14 hours ago. Described in her Twitter biography as a model, cover girl and law graduate, Ms Steenkamp tweeted about Valentine's Day. She said: "What do you have up your sleeve for your love tomorrow??? £getexcited £ValentinesDay" In response to someone else's plans, she said: "That sounds amazing! Wow that's what it's all about! It should be a day of love for everyone:) may it be blessed! Athletics South Africa declined to comment this morning, with a spokeswoman saying it was a private matter. A UK-based spokeswoman for the athlete also declined to comment. Career Pistorius is known as the Blade Runner because of the ground-breaking prosthetics he uses for racing. He made history at the London 2012 Olympics when he became the first amputee sprinter to compete in the able-bodied Games, running in the 400m and 4x400m relay. The Johannesburg-born athlete, who was born without fibulas in his legs and had the limbs amputated below the knee when he was 11 months old, had to win a legal battle over his blades with the International Association of Athletics Federations (IAAF) in 2008 for the right to compete in able-bodied competition.