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London • Forty-five more athletes, including 31 medalists, have been caught for doping after retesting of samples from the last two Summer Olympics, the IOC said Friday.

The new cases bring to 98 the total number of athletes who have failed tests so far in the reanalysis of their stored samples from the 2008 Beijing Olympics and 2012 London Games.

Using "the very latest scientific analysis methods," the latest round of retests produced 30 "provisional" positive findings from Beijing and 15 confirmed positives from London, the International Olympic Committee reported.

The IOC said 23 medalists from Beijing and eight medal winners from London were among those caught.

No names were given.

The IOC's news release cited 23 medalists from Beijing, but did not mention any from London. However, an IOC spokeswoman, Emmanuelle Moreau, confirmed later to The Associated Press that the London positive tests included eight medal winners.

The IOC stores doping samples for 10 years so they can be retested when new methods become available, meaning drug cheats who escaped detection at the time can be caught years later.

In a separate announcement Friday, the IOC stripped a Turkish weightlifter of her silver medal from the Beijing Games after her urine sample came back positive for steroids in new testing.

The IOC said Sibel Ozkan tested positive for stanozolol and was ordered to return her medal in the 48-kilogram class. The 28-year-old lifter also faces a possible ban from the International Weightlifting Federation.

Ozkan is the second athlete formally disqualified so far by the IOC in the retesting program. Last week, Ukrainian weightlifter Yulia Kalina was stripped of her bronze medal from the London Olympics after her sample came back positive for the steroid turinabol.

The retesting program has targeted athletes who were in contention to compete at the upcoming Olympics in Rio de Janeiro, but has also been widened to cover many medalists.

"All athletes found to have infringed the anti-doping rules will be banned from competing" at the Rio Games, the IOC said.

The announcement comes at a time when the IOC is weighing whether to ban Russia from the Rio Olympics over allegations of systematic and state-run doping.