A newspaper has said that a third of the world's top athletes at the 2011 World Athletics Championships cheated. A study showed that 29-34 per cent of athletes used drugs in the year before the games. Reporters say that the International Association of Athletics Federations (IAAF) knew about this.

The report is a big shock. The newspaper said medal winners in long-distance races had unusual blood tests. The World Anti-Doping Agency (WADA) said it would investigate. The author of the report was told not to discuss it. He said the IAAF and WADA "just blocked the whole thing".