The IOC said all four -- Victoria Valyukevich, a triple jumper who was eighth in the women's competition, hammer throwers Gulfiya Khanafeeva and Mariia Bespalova, and weightlifter Khadzhimurat Akkaev, who did not compete due to a back injury, had tested positive for anabolic steroid turinabol.
India's quartermiler Nirmala Sheoran has been handed an eight-year ban by National Anti-Doping Agency's (NADA) Disciplinary Panel after she returned positive for a banned substance in a test conducted last year.
The International Olympic Committee (IOC) will retest frozen samples from previous Games after an improved testing method led to hundreds of positive cases that went undetected, according to a German television channel.
The International Olympic Committee (IOC) said it had disqualified weightlifting gold medallists Cao Lei (75kg), Chen Xiexia (48 kg) and Liu Chunhong (69kg) from the Beijing Games after they tested positive for prohibited substances.
Haryana sprinter Dharambir Singh, who was barred from representing the country in the Rio Olympics at the last minute for failing a dope test, has been slapped an eight-year ban by the National Anti-Doping Agency.
Russia's Yulia Efimova faces a life ban after the breaststroke specialist tested positive for meldonium, with her temporary suspension confirmed by the All-Russian Swimming Federation (ARSF) on Thursday.
Britain's double Olympic champion Mo Farah has said he will continue to work with coach Alberto Salazar who is being investigated by the U.S. Anti-Doping Agency (USADA).
Overcoming the dope scandal, which almost derailed his hopes of competing at the Rio Olympics, wrestler Narsingh Yadav said he would want to forget about the toughest phase of his life and solely focus on winning a medal on August 19. Narsingh reached Rio de Janeiro along with India's chief coach Jagminder Singh and checked into the Games Village.
'WADA had never intervened in Narsingh's matter and no clearance is required.'
Bulgaria's weightlifters will be absent from next year's Olympics after the sport's governing body banned the country's athletes following a high number of doping cases, it said on Friday.
Kumari's dope sample, taken out-of-competition by the AIU last year, was found to contain steroids
Former World double sprint champion Tyson Gay has been suspended for one year after testing positive in 2013 for a banned anabolic steroid, the US. Anti-Doping Agency (USADA) said on Friday.
The World Anti Doping Agency has rejected the National Anti Doping Panel verdict on wrestler Narsingh Yadav after he was given a clean chit to compete in Rio Olympic Games, according to reports on Monday.
International athletics federation's Athletics Integrity Unit tweeted late on Tuesday to confirm Gomathi's dope flunk
Raising doubts on the possibility of foul play in the Narsingh Yadav doping scandal, Maharashtra Chief Minister Devendra Fadnavis hinted the wrestler may have been 'tricked or framed', while asking the Union Sports Minister to look into the case.
Narsingh Yadav's chances of representing India at the upcoming Olympics might have diminished further after a second failed dope test but the Wrestling Federation of India (WFI) is still hopeful of a favourable verdict by the NADA panel, saying that his lawyers, on Wednesday, presented a strong case.
A look at the 10 cricketers who were punished for drug related offences.
A summary of sports events and sports persons, who made news on Friday
The International Weightlifting Federation dropped the doping charge against Indian weightlifter K Sanjita Chanu due to "non-conformities" in the handling of her sample but the Commonwealth Games gold-medallist has demanded an apology and compensation for the "trauma" she has endured. The IWF made the decision based on the recommendation of the World Anti-Doping Agency (WADA). The 26-year-old, who claimed innocence since the beginning, was informed about the final verdict via an e-mail, signed by IWF's legal counsel Lilla Sagi.
Dutee Chand had claimed before NADA's Anti-Doping Disciplinary Panel (ADDP) that it was a case of "unintentional consumption".
Caught in the dope net, Asian Games bronze-medallist javelin thrower Davinder Singh Kang on Sunday said the failed result is because of a declared medication he took for sore throat and he is confident of being cleared in the disciplinary hearing.
If Sumit Malik's B sample also returns positive, he can be banned from the sport.
India's double-Olympic medal winning wrestler Sushil Kumar, on Saturday, conceded that he has met top officials of the WWE but ruled out any immediate move to professional wrestling.
Norwegian cross-country skier Therese Johaug says she is 'devasted' after her country's skiing federation confirmed the 28-year-old had returned a positive test for a banned substance found in sunburn cream on Thursday.
A day after wrestler Narsingh Yadav was exonerated of doping charges by the National Anti-doping Agency (NADA), its parent world body WADA said that it will review the case.
His Olympic dream in jeopardy after a failed dope test, wrestler Narsingh Yadav claimed innocence, saying that the scandal is a conspiracy against him.
The IWF has admitted to mentioning two different urine sample numbers in its communication of her dope flunk earlier this year, according to a letter that the world body sent to the National Anti-Doping Agency (NADA).
Jamaican Shelly-Ann Fraser-Pryce broke the 40-year-old Pan Am Games 200 metres record on Friday. The twice Olympic 100 metres champion clocked 22.43 seconds to win gold on Friday.
Chanu has decided to present her case before the hearing panel of the International Weightlifting Federation (IWF) in Hungary.
Summary of sports events and persons who made news on Friday
Russian steeplechaser Yulia Zaripova has been banned for two and a half years for doping offences, the Russian anti-doping agency RUSADA said (www.rusada.ru) on Friday.
Alberto Salazar, the coach of Britain's Olympic champion Mo Farah, has been accused of using prohibited infusions of supplements to improve the performance of his runners, the Sunday Times reported citing a leaked United States Anti-Doping Agency (USADA) report.
Russian Yulia Efimova, who won two Olympic silver medals this month after being cleared to compete in Rio following a doping ban, has compared swimming in the Games to being at war. Initially excluded from the event because of her doping record, the 24-year-old won a last-minute legal challenge to the Court of Arbitration for Sport (CAS) and finished second in the 100 and 200 metres breaststroke in Brazil. "I felt under pressure from the sportsmen, the fans, the press. This was awful and it was not like being at an Olympics, which usually unites people. This was not a competition, but a war - a old war," Efimova told a news conference on Wednesday.
Commonwealth Games gold medallist weightlifter Sanjita Chanu has failed a dope test, the international federation said on Thursday.
Britain's double Olympic champion Mo Farah said on Tuesday he was '100 per cent clean.'
"The CAS Panel found it more likely than not that the origin of the prohibited substance was contaminated beef consumed in a restaurant the day before the test," sport's highest court said in a statement.
Russian swimming chief Vladimir Salnikov said on Tuesday the atmosphere surrounding his team at the Olympics reminded him of the Cold War, and criticised American breaststroke champion Lilly King for attacking the integrity of her Russian rival.
Tainted wrestler Narsingh Yadav was exonerated of doping charges by the National Anti-Doping Agency panel, probing the positive tests on his urine samples on Monday. It ruled "there is no negligence on the athlete's part and he is a victim of sabotage".
Too much exercise and eating disorders are some of the underlying factors that may affect fertility in women, says gynaecologist Dr Archana Dhawan Bajaj,
Summary of sports events and persons who made news on Wednesday
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