Lance Armstrong doping investigation closed with no charges

Federal prosecutors in Los Angeles announced Friday they were closing an investigation into “allegations of federal criminal conduct” by members and associates of a racing team owned by cyclist Lance Armstrong.

No charges will be filed, officials said.

U.S. Atty Andre Birotte Jr. said the announcement was warranted due to reports in media outlets about the investigation. Attorneys representing Armstrong have previously filed papers in federal court alleging illegal leaks by federal agents about a secret grand jury investigation.

Last May, Olympic cycling gold-medal winner Tyler Hamilton, who served a two-year suspension for doping, told  CBS' "60 Minutes" how he, Lance Armstrong and other members of the U.S. Postal Service team used banned substances.

Armstrong has denied any wrongdoing.

In the "60 Minutes" interview, Hamilton says team members used several banned substances, including EPO and testosterone. Hamilton was among the people subpoenaed by the Los Angeles grand jury that is hearing evidence in an investigation of doping in cycling, according to a Times story in May.

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Photo: Lance Armstrong rides in the prologue of the Amgen Tour of California in 2009 in Sacramento. Credit: Doug Pensinger/Getty Images