Fresh allegations of doping involving hundreds of blood samples are rocking the world of athletics.

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.

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.”

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”.

The world anti-doping agency says it is alarmed by the extent of the allegations.

“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