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dpa/afp
Rio de Janeiro
Chinese swimmer Chen Xinyi and Bulgarian steeplechaser Silvia Danekova have tested positive for banned substances in the first failed doping tests at the Rio Olympics.
The 18-year-old female swimmer failed a doping test in Rio de Janeiro on August 7, the Chinese news agency Xinhua reported, citing the Chinese Swimming Association.
The swimmer has asked for an examination of the B sample.
Further details about the doping investigation were not immediately known. International Olympic Committee spokesman Mark Adams said on Friday that his organisation would not comment until the Court of Arbitration for Sport, which is for the first time independently handling doping cases, completes its procedure.
"We will not comment on any name of any athlete, any sport, any national Olympic committee until the procedure is over and the decision has been communicated, which for reasons of justice is I think the correct decision," Adams told journalists in Rio.
Chen Xinyi finished fourth in the 100-metre butterfly on Sunday and was scheduled to compete in the 50-metre freestyle on Saturday.
The Bulgarian Olympic Committee confirmed on Friday that both the A and B samples of a doping probe on Danekova were positive.
The 33-year-old was tested on July 30 immediately upon her arrival in the Olympic Village and was found positive for the performance boosting eryrhropoiesis-stimulating agent (ESA), which stimulates red blood cell production.
Danekova, who was due to compete in Saturday's 3,000m steeplechase heats, has been suspended.
She told Bulgarian broadcaster bTV she would now end her athletic career.
Bulgaria's sports ministry condemned Danekova, saying in a statement:"It is inadmissible that the image of Bulgaria is destroyed in this way and a stain placed on the entire Bulgarian sport."
Polish Olympic champ weightlifter fails dope test after brother
Polish 2012 Olympic champion weightlifter Adrian Zielinski has been banned from Rio Games after testing positive for the anabolic steroid nandrolone just three days after his brother Tomasz suffered the same fate, Poland's Anti-doping committee said on Friday.
The drug was detected as the 27-year-old was gearing up for last Saturday's 94kg competition in Rio. His brother Tomasz, 25, was also registered for the contest before he also tested positive.
Adrian Zielinski, gold medal winner in the 85kg category at the London Olympics, and European champion Tomasz, have denied any wrongdoing.
Zielinski told Polish media they were"set up", but did not elaborate on the comment.
"I'd have to be a complete idiot to train for a medal and come to Rio on some kind of drug," Adrian told Poland's TVN 24 news channel in Rio.
"I have too much to lose to use doping," he said, adding"It's some kind of a manipulation. Someone must have set us up."
Poland's weightlifting federation president Szymon Kolecki gold medal winner in Beijing stepped down on Tuesday after Tomasz Zielinski was eliminated from competition.
