The US Anti-Doping Agency said Tuesday it has gathered "overwhelming" evidence that Lance Armstrong and fellow US Postal Service cyclists had engaged in sport's biggest doping conspiracy ever.

In a statement, the agency said it was releasing its "reasoned decision" and more than 1,000 pages of supporting evidence to the Union Cycliste International and the World Anti-Doping Agency.

"The evidence shows beyond any doubt that the US Postal Service Pro Cycling Team ran the most sophisticated, professionalized and successful doping program that sport has ever seen," it said.