The US federal government has reportedly asked French judicial authorities to co-operate in an investigation into claims by Floyd Landis that the seven-times Tour de France winner Lance Armstrong used banned substances.
Reuters says a close source told the news agency there'd been a meeting in France between French Anti-Doping officials and a US special investigator, a prosecutor and the US anti-doping agency head.
The American trio also met with members of Interpol in Lyon.
Five years ago the sports daily L'Equipe reported that samples taken from Armstrong during the 1999 Tour showed traces of the banned blood-boosting EPO.
Although an independent panel cleared Armstrong, the World Anti-Doping Agency 's former president Dick Pound questioned the investigation's integrity.
Landis, the disgraced 2006 Tour winner said in May that Armstrong, a former team-mate, used performance-enhancing drugs.