Brazilian police stopped two US Olympic swimmers from boarding a flight home on Wednesday to question them about how they and two team mates were robbed at gunpoint in Rio de Janeiro at the weekend, after a judge raised doubts over their accounts.
A third swimmer, James Feigen, is in contact with Brazilian authorities and plans to make further statements to them on Thursday, said a spokesman for the US Olympic Committee (USOC).
Federal police also want to question US gold medallist swimmer Ryan Lochte, one of swimming's most decorated Olympians, but he had already flown home to the United States on Monday, a police spokesman said.
The four swimmers have said they were robbed by gunmen while returning to the Athletes' Village in a taxi in the early hours of Sunday after a party - an incident that stoked fears for the safety of athletes and visitors at South America's first Games.
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