Belarusian women's shot put gold medallist, Nadzeya Ostapchuk
Belarusian women's shot put gold medallist, Nadzeya Ostapchuk has been stripped of her title after failing a doping test, the International Olympic Committee has announced.
Ostapchuk, 31, threw 21.36m with her third attempt to win in the Olympic Stadium last week, reports the BBC
But Ostapchuk has now been disqualified after officials said metenolone was found in a urine sample she provided.
New Zealand's Valerie Adams, who was second, has now been awarded gold.
An IOC statement said: "The athlete was first requested to provide a urine sample for a doping control on August 5.
"She competed the next day in the women's shot put event, where she placed first, and was asked to provide a sample straight after her competition.
"Both samples indicated the presence of metenolone, which is classified as anabolic agent under the 2012 prohibited list."
Ostapchuk won gold at the 2010 European Championships, but was second to Adams at the 2011 World Championships.
London 2012 saw the biggest anti-doping operation in the history of the Olympic Games.
Before the start of the Olympics, those competing were warned that 150 scientists were set to take 6,000 samples between now and the end of the Paralympic Games.
Every competitor who won a medal at the Olympics was tested.
British discus thrower, Brett Morse apologised to his Twitter followers after accusing Ostapchuk of doping last week.
Morse made the claim after he failed to qualify for the Olympics discus final and also tweeted: "I've had a bad day but it could be worse, I could look like Ostaptchuk [sic]."