MIAMI/RIO DE JANEIRO (Reuters) - A U.S. Olympic swimmer has accused his team mate, Ryan Lochte, of playing a key role in an incident that has tainted South America's first Games, saying he tore a poster off a wall and argued with armed security guards at a Rio gas station.

In his first account of last week's incident, the youngest of the four swimmers involved, Gunnar Bentz, 20, said the guards confronted them after they had urinated behind some bushes and Lochte tore a metal-framed advertising poster from a wall.

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