The U.S. Anti-Doping Agency is bringing doping charges against seven-time Tour de France winner Lance Armstrong, questioning his victories in those storied cycling races.

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Armstrong, who retired from cycling last year, could face a lifetime ban from the sport if he is found to have used performance-enhancing drugs.

The story was first reported Wednesday by the Washington Post.

The charges from USADA come just months after federal prosecutors closed a two-year criminal investigation of Armstrong without indicting him.

Armstrong maintained his innocence, saying: "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."

(Copyright 2012 by The Associated Press.  All Rights Reserved.)

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