A former cycling teammate said seven-time Tour de France winner Lance Armstrong used performance-enhancing drugs before several events, including the Tour de France, according to an interview with CBS' "60 Minutes."
In the interview, part of which CBS aired Thursday on the "CBS Evening News," Tyler Hamilton admitted that he, Armstrong and members of the U.S. Postal Service team often used banned substances. Hamilton has served a two-year suspension for doping.
Armstrong rebutted the allegation Thursday night on Twitter saying: "20+ year career. 500 drug controls worldwide, in and out of competition. Never a failed test. I rest my case."
Hamilton, who won an Olympic gold medal in 2004, told "60 Minutes" that he knowsÂ Armstrong used EPO, which helps boost endurance, several times, including in his win for the 1999 Tour de France.
"I saw (EPO) in his refrigerator. ... I saw him inject it more than one time like we all did, like I did many, many times," Hamilton said.
Armstrong on Thursday night tweeted for his followers to go to Facts4Lance.com, a site dismissing several doping allegations lodged against Armstrong over the years. Armstrong has always said he never took banned substances. He has never failed a drug test but repeatedly has been accused of using performance-enhancing drugs by other riders.
"Tyler Hamilton is a confessed liar in search of a book deal - and he managed to dupe 60 Minutes, the 'CBS Evening News,' and new anchor Scott Pelley," Armstrong lawyer Mark Fabiani said in a statement. "Most people, though, will see this for exactly what it is: Â More washed-up cyclists talking trash for cash."
Hamilton, who had previously denied using the substances, said that he and riders took the drugs because they felt they needed to gain an edge.
"(Armstrong) took what we all took ... ," Hamilton told CBS.Â "There was EPO ... testosterone ... a blood transfusion."