AUSTIN, Texas -- Lance Armstrong is facing more doping allegations just a few months after he thought he had finally put them to rest.
Although federal investigators in February closed a two-year investigation without bringing criminal charges, the U.S. Anti-Doping Agency has filed new doping charges that could strip the seven-time Tour de France winner of his victories in cycling's premier race.
Armstrong insists he is innocent.
"I have never doped, and, unlike many of my accusers, I have competed as an endurance athlete for 25 years with no spike in performance, passed more than 500 drug tests and never failed one," Armstrong said in a statement. "Any fair consideration of these allegations has and will continue to vindicate me."