Spain's anti-doping a agency says prosecutors in the eastern province of Alicante are examining the Spanish citizens mentioned in a report by the U.S. Anti-Doping Agency.
The head of the U.S. Anti-Doping Agency wants Lance Armstrong to come forward with information detailing the alleged complicity of cycling's governing body in his doping.
The government had previously announced it would join a whistle-blower lawsuit brought by former Armstrong teammate Floyd Landis under the federal False Claims Act.