Four US Olympic swimmers who said they had been robbed in Rio were not victims of crime.
The head of the city's civil police, Fernando Veloso told reporters that one or more of the men had committed an act of vandalism at a petrol station and then offered to pay for the damage.
He says the Americans paid and left after armed security guards intervened.
He added one guard had drawn his gun after one of the swimmers began behaving erratically.
Three of the US swimmers remain in Brazil and are being questioned by police.
