The participation of 23 athletes in the Rio Olympics could be under threat, after doping samples gathered from London 2012 tested positive for banned substances.
A statement released by the International Olympic Committee (IOC) didn’t reveal the athletes’ names or nationalities, but said five sports and six countries were involved.
The revelation comes just 10 days after 31 athletes from the 2008 Beijing Games also tested positive for banned substances.
“These reanalyses show, once again, our determination in the fight against doping,” IOC President Thomas Bach said in a statement.
“We want to keep the dopers away from the Olympic Games in Rio de Janeiro. This is why we are acting swiftly now.
“I have already appointed a disciplinary commission, which has the full power to take all the decisions on behalf of the IOC.”
A total of 265 doping samples from London 2012 were retested, while one further sample from Beijing shows “abnormal parameters.”
Friday’s revelations — “all based on intelligence-gathering that began in August 2015,” the IOC said — only serve to darken the cloud of controversy lingering over the Olympic movement.
Russia’s track and field athletes are currently banned from international competition, a sanction which could prevent their participation in Rio 2016.
The Games begin on August 5.
“The reanalysis program is ongoing, with the possibility of more results in the coming weeks,” the IOC statement continued.
“They are part of the IOC’s efforts to protect the clean athletes by keeping dopers away from the Olympic Games Rio 2016 and protecting the integrity of the competition.”
Further, the IOC says retesting of the 454 Beijing samples and 265 London samples was carried out using the very latest scientific analysis methods.
“The athletes, National Olympic Committees and International Federations concerned are already being informed, after which the proceedings against the athletes can begin,” the IOC added.
“All athletes found to have infringed the anti-doping rules will be banned from competing at the Olympic Games Rio 2016.”