Three doping cases emerge at Pan Ams

GUADALAJARA, Mexico -- Three doping cases have emerged only hours before competition started at the Pan American Games on Saturday.

Brazilian runner Simone Alves da Silva and Puerto Rican mountain biker Kelvin Gonzalez both tested positive for EPO, while Chilean weightlifter Cristian Escalante tested positive for the stimulant methylhexaneamine.

The Brazilian athletics federation says it has suspended Silva and has withdrawn her from the Pan American Games.

Gonzalez and Escalante were also withdrawn from the games, according to their respective national Olympic committees.