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Athletics faces new doping crisis after 'biggest leak of blood-test data in sporting history' leaves World Anti-Doping Agency 'very alarmed'

More than a third of Olympic and world championships medals - including 55 golds - have been won by athletes with suspicious doping test results, the “biggest leak of blood-test data in sporting history” reportedly reveals.

It also suggests that at least 800 athletes - one in seven of those named in the files - have recorded blood-test results described by an expert as “highly suggestive of doping or at the very least abnormal”, according to the Sunday Times.

Another allegation is that more than a third of the world's fastest times in endurance events were recorded by athletes whose tests have triggered suspicion.