The IAAF has previously denied claims of widespread doping in the sport.

First the German documentary maker Hajo Seppelt revealed widespread doping in Russian athletics.

Dozens of people have been indicted in the US over a widespread doping scandal.

Then they were hit with allegations of widespread doping.

An inquiry in Australia last year found widespread doping and illegal drug use among athletes there.

That uncovered widespread doping in Russia and led to the country being banned from all athletics competition.

Cycling continues to struggle with widespread doping, according to a landmark report into the sport's troubled recent history.

Pound is currently heading a Wada independent commission investigating earlier allegations of widespread doping and cover-ups in Russia.

Evidence given to Canada's 1988 Dubin Commission by Francis and Johnson revealed just how widespread doping had been.

Track and field was jolted after a blockbuster report over the weekend alleged widespread doping in the sport.

Sports groups say an Australian investigation that's uncovered widespread doping in professional sport will have repercussions in New Zealand.

Armstrong was found guilty of widespread doping and was also subsequently stripped of his seven Tour de France titles.

Shlyakhtin took office in January 2016 pledging to overturn Russia's suspension from international track events due to widespread doping.

New Zealand sports groups say an Australian investigation that's uncovered widespread doping is certain to have repercussions in this country.

For years Athletics Kenya dismissed claims of widespread doping as attempts by foreigners to destabilise the world's greatest running nation.

Russia was banned from the world's top sporting events for four years in December over widespread doping offences, including the Tokyo Games.