The World Anti-Doping Agency is not fit for purpose and should be replaced, Britain's double Olympic decathlon champion Daley Thompson has said following its decision last month to lift a ban on Russia's anti-doping body.
Former champions Colin Jackson and Daley Thompson hit out at drug cheats on Monday, saying they had wrecked some sports and ruined the reputation of athletics.
American Ashton Eaton won his second straight Olympic decathlon gold medal on Thursday, extending his reign in a sport whose champion earns the title of the world's greatest athlete.
Usain Bolt has somewhat skewed the picture by making it look so easy but when it comes to retaining an Olympic athletics title, history shows that it is an extraordinarily difficult thing to achieve.
The London-based organisation did not give any reason for the cancellation, but said it would continue to support sports charity projects in Brazil. Rio state authorities also did not explain why the event would not take place as planned.
The International Association of Athletics Federations (IAAF) president Sebastian Coe announced a shake up of the organisation on Wednesday aimed at ensuring there can be no repeat of the corruption scandals that have dogged athletics' governing body during his first, tumultuous, year in office.
Sebastian Coe has long been one of the most outspoken critics of doping in athletics yet the newly-elected president of the sport's governing body has remained silent this week in the face of potentially its most damning drugs scandal yet.
In Rio, over 10,000 athletes will compete for the biggest prize in sport -- an Olympic gold medal.