Ryan Lochte may be back on U.S. soil, but that doesn't mean his problems in Rio de Janeiro are over.

According to the AP, Brazilian police charged Lochte on Thursday with filing a false robbery report following an incident during the Olympics.

The police issued a statement confirming the indictment, saying "The investigation was concluded on Thursday and Olympic American swimmer Ryan Lochte was indicted for the crime of falsely reporting a crime."

Melissa Nathan, the swimmer's spokeswoman, had no comment.

Ryan Lochte was charged in Brazil for filing a false robbery report. USATSI

Brazilian law states that the penalty for falsely filing a crime carries a maximum penalty of 18 months in prison. Lochte, who returned to America shortly after the incident, could be tried in absentia should he choose not to return to Brazil.

An extradition treaty exists between the United States and Brazil, but if Lochte is convicted U.S. authorities could also choose not to extradite the swimmer.

None of the other three U.S. swimmers involved in the incident -- including James Feigen, who initially corroborated Lochte's story but later gave a revised statement to the police -- have been charged with a crime.

Lochte admitted to partially fabricating a story about him and three of his teammates being robbed by men posing as police officers in the early morning of Aug. 15. He told the story to Rio police as well as NBC reporters following the alleged incident.

In the days following the incident, doubt was cast on Lochte's account of the details due to reports from witnesses and the release of security footage which showed the swimmers involved in an altercation at a Rio gas station on the morning in question.

Lochte has publicly apologized, but was dropped by all four of his major sponsors on Monday. Further sanctions are also expected from both the U.S. Olympic Committee and USA Swimming.