Re-tests of samples from eight Russian athletes who took part in the 2012 Olympics in London have tested positive for doping, the Russian Olympic Committee has said.
The committee said in a statement on its website that the International Olympic Committee had informed it of the positive doping results.
It did not reveal the names of the eight sports people but said they participated in three different types of sport.
Earlier in the week Russia announced that 14 of its athletes from the 2008 Beijing Olympics had tested positive for doping after their samples were re-tests.
23 athletes who competed at the London 2012 Olympics have failed drug tests after their samples were re-analysed.Read the full story ›
At least 10 Olympic medallists are reportedly among the Russian athletes who have tested positive for doping at the 2008 Beijing Games.Read the full story ›
Tennis star Maria Sharapova faces an anti-doping panel on Wednesday after testing positive for the banned drug meldonium in January.Read the full story ›
No British athletes will be implicated in the 31 who tested positive doping after the 2008 Beijing Olympics, ITV News understands.
ITV News Sports Editor Steve Scott, speaking from the IOC headquarters in Lausanne, said "the usual suspects" are likely to be involved - including Russia - and suggests the sports linked to the recent allegations include those already under the spotlight: "track and field, and weightlifting".
The results for the 250 test samples taken after the London 2012 Olympic Games are likely to be announced before June, he added.
The US Justice Department is investigating allegations of state-sponsored doping by "dozens" of top athletes in Russia, according to the New York Times.
Russia's Athletics Federation is currently suspended from all competitions - including the Olympic Games in Brazil, following a vote by the IAAF in November.
It led to the acting head of Russian Athletic Federation, Vadim Zelichenok, threatening to resign.
Thirty-one athletes have tested positive for doping following retesting of samples from the 2008 Beijing Olympics.Read the full story ›
Hundreds of people have signed a petition calling for doping in sports to be made a criminal offence.
The petition on change.org was started by the former Tory sports minister Lord Moynihan.
A competitor who deliberately cheats "shreds the dreams of clean athletes with every needle they inject", it says.
So far more than 300 people have signed the appeal, which will be delivered to the Prime Minister David Cameron and John Whittingdale, secretary of state for culture, media and sport.
Mark Bonar, the doctor at the centre of the Sunday Times doping allegations scandal, had his professional services dispensed with on Friday.
The Omniya Clinic said it had terminated its working relationship with Dr Bonar after it was revealed he does not have a licence to practise medicine in the UK.