Fresh allegations of doping involving hundreds of blood samples are rocking the world of athletics. <br /><br /> Results of over 12,000 blood tests from more than 5,000 athletes have been leaked to Britain’s Sunday Times and German broadcaster ARD including Olympic and world championship winners. <br /><br /> British broadcaster the BBC reported that one third of medals at the Olympics and world championships between 2001 and 2012 were won by athletes who have recored “suspicious tests.”<br /><br /> The BBC report said a third of medals in endurance events at the Olympics and world championships between 2001 and 2012 were won by athletes who have recorded “suspicious tests”.<br /><br /> The world anti-doping agency says it is alarmed by the extent of the allegations. <br /><br /> “Athletes must be presumed to be innocent until proven guilty,” said :Craig Reedie, World Anti-Doping Agency President. “These are wild allegations, wide allegations, and we have to check them out. And we will have that done by the commission as quickly as po