CCTV footage provided by Brazilian police on Thursday (August 18) shows U.S. Olympic swimmers attending a party in the early hours of Sunday (August 14) morning and arriving back at the Olympic Village at 7 a.m. local time (1000 GMT).
This was the same morning they said they were robbed at gunpoint in an incident that has marred the image of South America's first Olympic Games.
Recent footage and statements have raised questions as to whether the swimmers lied in their police reports regarding the incident.
The security-camera images appear to show the swimmers, including Olympic gold medallists Ryan Lochte and Jimmy Feigen, attending a party at the French hospitality house in Rio's south zone before arriving home in a calm and jovial state. The other two swimmers are Gunnar Bentz and Jack Conger.
Previous footage showed them in a dispute with staff at a Rio gas station, a fact they did not mention to police in their accounts.
A top Rio police official told Reuters on Thursday that the athletes lied about their story, declining to be identified because the matter was still under investigation.
A police source and staff at the station have said that the swimmers caused minor damage there, though there is still no consistent account.
The source said they damaged a bathroom door and staff said they tore down a poster and also urinated on the wall of station's convenience store.
On Sunday, Lochte had told NBC that the taxi he was travelling in with his three team mates was flagged down by robbers posing as police and they held a gun to his head during a robbery. He made no mention of stopping at a gas station.
NBC host Matt Lauer said late on Wednesday (August 17) that Lochte repeated a slightly modified version to NBC in an interview not yet aired, saying the swimmers had stopped at a gas station and that a gun was pointed in his direction during the robbery.
The Shell service station is close to the Olympic Park where sporting action has been overshadowed over the past two weeks by a string of muggings and robberies, including the hold-up of two visiting government ministers.
Staff at the station said the swimmers ripped an advertising plaque off the wall while they were urinating. Security was called and an argument ensued, said one employee who declined to give his name because he was instructed not to talk by police.
A sign on one of the bathrooms read: "Please Do Not Enter".
A spokesperson for the U.S. Olympic Committee (USOC) declined to comment on the video footage.
On Wednesday (August 17), Bentz and Conger were stopped from boarding a flight home by Brazilian police so they could question them about how the events on Sunday.
Feigen is in contact with Brazilian authorities and plans to make further statements to them on Thursday, said a spokesman for USOC.
Federal police also want to question Lochte, one of swimming's most decorated Olympians, but he had already flown home to the United States on Monday (August 15), a police spokesman said.