REUTERS - Doping and cycling officials were embroiled in a feud over who was to blame for widespread doping within the sport just hours Lance Armstrong breaks his silence over his alleged drug use in a television interview on Thursday.

In a scathing attack, World Anti-Doping Agency (WADA) chief John Fahey blasted the International Cycling Union (UCI), calling the independent commission set up by the governing body to look into the use of performance-enhancing drugs in cycling a "useless exercise."