The Washington Post broke this story and reports:

The U.S. Anti-Doping Agency brought formal doping charges against former cyclist Lance Armstrong in an action that could cost him his seven Tour de France titles, according to a letter sent to Armstrong and several others. As a result of the charges, Armstrong has been immediately barred from competition in Ironman triathlons, a discipline he took up after his retirement from cycling in 2011.

In the 15-page charging letter obtained by The Washington Post, USADA outlined new allegations against Armstrong, saying it collected blood samples from him in 2009 and 2010 that were “fully consistent with blood ma­nipu­la­tion including EPO use and/or blood transfusions.”

The charges represent the latest chapter in a long-running saga over whether Armstrong used banned substances during a cycling career that, along with his successful battle against testicular cancer, made him a national hero. Though for years Armstrong has successfully fended off challenges to his legacy, the action by USADA this week represents perhaps the most serious threat because of the anti-doping agency’s unique position of authority in the athletic drug-testing world.

The 12-year-old agency, which is funded jointly by the U.S. Olympic Committee and the federal government, almost never loses cases, though few athletes have the financial means or iconic status of Armstrong.

Armstrong has never tested positive for drugs, and on Wednesday he vehemently denied the USADA charges.

“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 released by his publicist. “That USADA ignores this fundamental distinction and charges me instead of the admitted dopers says far more about USADA, its lack of fairness and this vendetta than it does about my guilt or innocence. Any fair consideration of these allegations has and will continue to vindicate me.”

In February, the U.S. Attorney’s Office in Los Angeles ended a nearly two-year investigation into doping allegations involving Armstrong without bringing criminal charges. Armstrong’s former teammates Floyd Landis and Tyler Hamilton cooperated with federal agents in that investigation and publicly accused Armstrong of doping.

The Washington Post’s article can be read here, and the  UDADA 15 page letter here.