Lance Armstrong accuses US Anti-Doping Agency of waging a 'vendetta' against him in series of angry tweets Four riders - Gerorge Hincapie, Levi Leipheimer, Christian Vande Velde and David Zabriske - are rumoured to have given evidence in the USADA investigation. The manager of Garmin-Sharp, for whom David Zabriske and Christian Vande Velde ride, has dismissed the reports as false, this morning tweeting: "Regarding the Dutch media report: No suspensions have been given to any member of Slipstream Sports. Today or at any future date. USADA have previously said they will not be making any further statements on the Armstrong "case" until it is concluded, but the world governing body (UCI) has requested this afternoon that USADA provide information on what has been reported.