Ryan Lochte and three other American swimmers were robbed at gunpoint early Sunday by thieves posing as police officers who stopped their taxi and took their money and belongings, the U.S. Olympic Committee said.

In the latest security incident to hit the Rio de Janeiro Games, Lochte told NBC that one of the robbers put a gun to his forehead before taking his wallet. No one was injured.

Lochte and his teammates were returning to the athletes village by taxi after a night out at the French Olympic team’s hospitality house in the Rodrigo de Freitas area in the upscale south zone of the city. The outing was several hours after Olympic swimming ended Saturday night at the Rio Games.