The head of the World Anti-Doping Agency has launched an astonishing blast at the International Cycling Union (UCI) over its handling of the Lance Armstrong case.
WADA president John Fahey has accused the UCI of setting up a "useless" independent commission into the case, avoiding its responsibilities, blaming others, and missing a previous opportunity to deal with accusations of Armstrong's doping.
The row comes after the UCI refused to agree to a truth and reconciliation commission for cycling, which would have seen an amnesty where cyclists and officials could admit to doping without fear of disciplinary action.
It will put further pressure on the UCI's president Pat McQuaid and honorary president Hein Verbruggen, who have been in the firing line for the governing body's alleged failure to have tackled doping in the past.
The UCI said it would only agree to a truth and reconciliation process involving all sports, not just cycling, and criticised WADA for refusing to take part in the commission's probe.
Fahey responded by saying: "After careful review of the terms of reference and the commission's proposed work programme, WADA reached the conclusion that the UCI was not allowing the commission to conduct a proper and independent investigation.
"Therefore, WADA has decided not to take part and invest its limited resources into such a questionable and useless exercise. It has again become apparent that rather than deal with the obvious problems that exist within the sport of cycling, the UCI once again would like to avoid its responsibilities and instead seek to blame WADA and others.
"This is not the first time that the UCI has acted in this way. In 2005 when an opportunity arose to address an allegation of doping by Armstrong, the UCI commissioned a so-called independent report - the Vrijman Report - which totally failed to address the substance of the allegations against Armstrong.
"The shortcomings of the Vrijman Report were obvious at the time and more so today."
Fahey said cycling now had to confront its past and not deflect the blame. He added: "It has become typical of the UCI to point fingers at others when yet another doping controversy hits the sport of cycling."