The international sports tribunal has stripped Russian runner Mariya Savinova-Farnosova of the London Olympics 800 metres gold medal and handed her a four-year ban for doping.
The Court of Arbitration for Sport said there was "clear evidence" that Savinova was involved in doping from the eve of the European Championship in Barcelona in 2010 until the 2013 world championships in Moscow -- including for the 2012 London Games.
The ban was back-dated to start on August 24, 2015. CAS said all prizes won between July 26, 2010 and August 19, 2013, are forfeited.
The CAS acted as the main tribunal in the case as the Russian athletics federation is suspended by the world body, the International Association of Athletics Federations because of its doping controversy.
(With inputs from AFP)