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Lance Armstrong competes during the 2011 XTERRA World Championship triathalon on Sunday, Oct. 23, 2011, in Kapalua, Hawaii. Armstrong finished 23rd. (AP Photo/Wayne Jones)

Feds won't charge Armstrong with doping

Federal prosecutors closed their investigation of Lance Armstrong without charging him over allegations he used performance-enhancing drugs Feb. 3, ending a nearly two-year effort aimed at examining whether a doping program was created to keep the seven-time Tour de France winner and his teammates running at the head of the pack.