RIO DE JANEIRO — Brazilian police said Thursday that swimmer Ryan Lochte and three U.S. teammates were not robbed after a night of partying, and the intoxicated athletes instead vandalized a gas station bathroom and were questioned by armed guards before they paid for the damage and left. The robbery that was or wasn't has become the biggest spectacle outside of the Olympic venues in Rio, casting a shadow over American Olympians in Brazil amid an otherwise remarkable run at the Summer Games. The ordeal was also a blow to Brazilians, who for months endured scrutiny about whether the city could keep athletes and tourists safe given its long history of violence.