Ryan Lochte among four US swimmers robbed by armed men in Rio

Ryan Lochte and three other American swimmers have been robbed at gunpoint by thieves posing as police officers who stopped their taxi and took their money and belongings, the US Olympic Committee (USOC) said.

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