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A British has claimed that around a of the world's athletes at a event cheated by using drugs. A study carried out at the World Athletics Championships in Daegu, South Korea in 2011 showed that 29-34 per cent of the used performance-enhancing in the 12 months. Reporters say that the International Association of Athletics Federations (IAAF) knew about the report but blocked its . The IAAF said there were many wrong with the report. It is in to help publish it.

The report is a shock to the athletics . The newspaper said that a third of the winners in endurance at the Olympics and World Championships had very unusual blood . The World Anti-Doping Agency (WADA) said it would investigate the in the report. An independent has already started on this. The lead author of the report said that he and his were told not to discuss their research or the report. He said he thought that the IAAF and WADA "just blocked the whole ".