Tyson Gay 'admits positive drug test'

US sprinter Tyson Gay says he will pull out of next months's athletics World Championships after testing positive for a banned substance, according to the Associated Press.

Tyson Gay is US record holder at 100m Credit: DAVE HUNT/AAP

The former 100m and 200m world champion reportedly said: "I don't have a sabotage story. I basically put my trust in someone and was let down."

Gay has run the fastest time in the world this year, clocking 9.75 seconds at the US World Championships trials last month.

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Athletes 'given supplements'

Paul Boyle, manager of Asafa Powell and Sherone Simpson, has told ITV News the athletes were given 'supplements' by their physiotherapist. He says if any of the supplements were not legal, they had been supplied unwittingly.