Russian Tatyana Tomashova's result in the women's 1,500 metres at the 2012 London Olympics has been officially annulled, the Athletics Integrity Unit (AIU) said on Tuesday. Tomashova was banned for 10 years by the Court of Arbitration for Sport (CAS) in September for anti-doping rule violations at the Games and stripped of her silver medal from the race, often described as the "dirtiest" in history. She became the fifth of the 13 athletes in the final to receive a retroactive sanction for an