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Doping retests have found banned substances in 45 athletes from the Beijing and London Olympic Games.
Of the 30 in Beijing, 23 were medallists, the International Olympic Committee said.
The reanalysis of the tests are part of the IOC’s efforts to keep dopers away from the Olympic Games Rio 2016.
"All athletes found to have infringed the anti-doping rules will be banned from competing at the Olympic Games Rio 2016," the IOC said.
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A series of re-testing and an investigation will take place into Russian athletes who took part in the 2014 Olympics Winter Games in Sochi.
Coaches, officials and support staff will be put under the microscope, following the McLaren Report into widespread manipulation of doping tests.
The IOC will initiate reanalysis, including forensic analysis, and a full inquiry into all Russian athletes who participated in the Olympic Winter Games Sochi 2014 and their coaches, officials and support staff. For this purpose, a specific Disciplinary Commission is set up under the chairmanship of Mr Denis Oswald. Following the report of this Commission, the IOC EB will impose all the appropriate sanctions.
The International Olympic Committee have delayed their decision on whether to ban all Russian athletes from Rio 2016 until Friday.
An appeal against a previous sanction against Russia will be heard on Thursday by The Court of Arbitration for Sport.
The IOC say they will "explore the legal options with regard to a collective ban of all Russian athletes for the Olympic Games 2016 versus the right to individual justice".
With regard to the participation of Russian athletes in the Olympic Games Rio 2016, the IOC will carefully evaluate the IP Report. It will explore the legal options with regard to a collective ban of all Russian athletes for the Olympic Games 2016 versus the right to individual justice. In this respect, the IOC will have to take the CAS decision on 21 July 2016 concerning the IAAF rules into consideration, as well as the World Anti-Doping Code and the Olympic Charter.
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Russian long jumper Darya Klishina has been cleared to compete as a "neutral" athlete at the Rio Olympics, the IAAF has announced.
Athletics' world governing body said in a statement that the 25-year-old, who trains at the IMG Academy in Florida, had become the second athlete to meet its "exceptional eligibility criteria".
But Russian news agency TASS said all other applications from Russian athletes, including pole vault great Yelena Isinbayeva, had been rejected.
The head of the legal department at the Russian Olympic Committee, Alexandra Brilliantova, was quoted by TASS as saying: "The refusals were received by everyone, except for Klishina."
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Russian doping whistleblower Yuliya Stepanova has become the first athlete to be granted permission to compete at the Rio Olympics under a neutral flag.
The 29-year-old 800m runner passed the "exceptional eligibility" guidelines set out by the International Association of Athletics Federations (IAAF).
The IAAF voted last month to maintain a global competition ban on the All-Russia Athletic Federation.
Stepanova turned whistleblower after receiving a ban for abnormalities with her biological passport.
She and her husband colluded with a journalist in secretly taping Russian athletes and coaches, which exposed the systemic and state-sponsored doping programme.