The United States Anti-Doping Agency have initiated legal proceedings over allegations of doping against seven-time Tour de France winner Lance Armstrong.
The USADA revealed it had sent Armstrong written notification regarding "allegations of anti-doping rule violations" during his time with the United States Postal Service (USPS) cycling team.
The USADA confirmation came hours after Armstrong, 40, released a statement of his own to angrily deny the claims, which, if proved, could see him stripped of the Tour titles he won while with USPS.
Following those comments the USADA released their own statement to confirm that it had initiated legal proceedings, which would immediately prevent Armstrong from competing as a triathlete - the sport he took up following his retirement from cycling in 2011.
Armstrong survived testicular cancer early in his career and went on to win seven consecutive Tour de France titles from 1999 to 2005 while competing for the US Postal Service team and the Discovery Channel team.
He retired after the 2005 Tour de France, but returned in 2009, riding for Astana Cycling and RadioShack before retiring for a second time in February 2011, taking up triathlon earlier this year.