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.
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.
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.
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.
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.
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.
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.
In Rio, over 10,000 athletes will compete for the biggest prize in sport -- an Olympic gold medal.
It is the first break in the four-year cycle for the summer Olympics since the 1940 and 1944 Games were cancelled because of World War Two.
There was little fanfare but a few lessons perhaps learnt as the most expensive player in the history of English football - Angel di Maria - lasted 70 minutes on his Premier League debut for Manchester United in their goalless draw at Burnley on Saturday.