Russian prosecutors say they will investigate allegations that the country's athletes doped at three recent Olympic Games.
According to spokesman Alexander Kurennoi, the Prosecutor General's office is examining possible "doping by Russian athletes at the Olympics in Beijing, London and Sochi".
Kurennoi, speaking to state news agency Tass, cited "information published by various media and the World Anti-Doping Agency", but it was not immediately clear which specific allegations would be the focus of the investigation.
The former director of the Russian anti-doping laboratory told the New York Times last week that he provided athletes with banned steroids ahead of the 2012 London Olympics and 2014 Sochi Winter Games.
Russian prosecutors previously investigated after a WADA panel report detailed systematic, state-sponsored doping in Russian track and field. That probe resulted in no criminal charges.
