The former 100m world record holder Asafa Powell has tested positive for a banned substance, reports Reuters.
Powell competed against Tyson Gay at London 2012, and ran in the 100m final where he finished eighth.
Gay has revealed that he has also tested positive for a banned substance.
As Tour de France leader Froome can attest, the shadow of a drug scandal can linger for years. Athletics must act to avoid this cancer.
Paul Boyle, manager of Asafa Powell and Sherone Simpson, has confirmed that both have left Italy. They are in the air now.
Adidas AG has suspended its contract with Tyson Gay after the former double world sprint champion failed an out-of-competition dope test.