According to The Associated Press, a person close to the situation spoke on a condition of anonymity, claiming that Armstrong confessed to using performance-enhancing drugs to win the Tour de France during an interview with Oprah for OWN's Oprah's Next Chapter.
ABC News reports that Armstrong spoke to about 100 Livestrong Foundation staffers in Austin, Texas prior to his interview. Spokeswoman Katherine McLane described Armstrong's speech to ABC News, calling it a "sincere and heartfelt apology" in which he "took responsibility" for any trouble that he may have brought on the foundation.
A report from the U.S. Anti-Doping Agency led to Armstrong being stripped of his seven Tour titles last year, but Armstrong has maintained his innocence until now.
USADA chief executive Travis Tygart has accused Armstrong of taking part in "the most sophisticated, professionalized and successful doping program that sport has ever seen."