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article in British newspaper The Sunday Times claims that around third of world's top athletes at a major event cheated by using drugs. The newspaper says study was carried out during World Athletics Championships in Daegu, South Korea in 2011. It showed that 29-34 per cent of 1,800 competitors had used performance-enhancing drugs in previous 12 months. Reporters say that International Association of Athletics Federations (IAAF) knew about report but blocked its publication. The study was conducted by Germany's University of Tubingen. The IAAF said there were many things wrong with report. It added that it is in discussions to help publish it one day.

The details in report are huge shock to athletics world. The Sunday Times reports that one-third of medals in endurance races at Olympics and World Championships were won by athletes who had very unusual blood readings. The World Anti-Doping Agency said on Friday that it would investigate claims in report. It said independent commission has already started work on this. The lead author of report, Dr Rolf Ulrich, told The Sunday Times that he and his colleagues were ordered not to discuss their research or report. He said: "It's because IAAF is blocking it. I think they are stakeholders with WADA and they just blocked whole thing."