"Overwhelming" evidence shows top cyclist Lance Armstrong engaged in the biggest doping conspiracy in sports history to win the Tour de France seven times, the US Anti-Doping Agency (USADA) said on Wednesday.

USADA chief executive Travis T. Tygart said USADA has submitted a report on why it banned Armstrong for life in August to the International Cycling Union (UCI) and World Anti-Doping Agency (WADA) and released more than 1,000 pages of supporting evidence gathered in a probe of Armstrong and the US Postal Service team.