RIO DE JANEIRO — The American swimmers Ryan Lochte, Jimmy Feigen, Jack Conger and Gunnar Bentz left a lavish Olympics party hosted by the French authorities early Sunday morning. They got into a taxi for the ride across Rio de Janeiro to their lodgings in the athletes’ village. What happened next has been the subject of intense police scrutiny, diplomatic debate and widespread criticism — first for Rio’s crime problems, and then for the behavior of the four American athletes.

What’s the latest?

Mr. Conger and Mr. Bentz were allowed to fly back to the United States on Thursday night. (The night before, they were pulled off their flight and detained for questioning.) Mr. Feigen agreed to donate $11,000 to a Brazilian charity in an effort to receive permission to leave the country, according to news reports Friday morning. Mr. Lochte returned to the United States earlier in the week and apologized Friday for his role in the episode (see below).

What happened?

The taxi stopped at a gas station and the swimmers got out to use the restroom. The police say that after one or more of them vandalized the restroom, a security guard brandished a gun to keep them under control until the police arrived. The chief of police said Thursday that the swimmers paid for the damages — about $50 — and left before the police arrived. In his original account, Mr. Lochte said the car had been pulled over by armed men, one of whom put a gun against his head before taking the cash from his wallet. He subsequently altered his version of events.