Nigerian hurdler Samuel Okon, who finished sixth in the Commonwealth Games 110 metres hurdles final, has failed a drugs test.
Commonwealth Games Federation president Mike Fennell revealed that Okon had tested positive for the stimulant methylhexaneamine.
Okon is the second Nigerian athlete to test positive for the stimulant in Delhi, with women's 100m winner Osayemi Oludamola revealed to have failed a test yesterday.
Fennell said: "I have to report a second anti-doping violation.
"It is another Nigerian athlete, Samuel Okon in the 110m hurdles, and it is the same substance, methylhexaneamine.
"The athlete has been notified and there will be a provisional hearing later today."
Fennell added: "We are concerned with the number of incidents that are coming up with the same substance.
"At this stage I cannot speak very definitively as to where it's coming from but it appears that it may be coming from the use of supplements.
"The supplements industry is by and large an unregulated industry worldwide and it is an industry that is a cause of great concern, not only for the fight against doping but also the protection of athletes."
Asked when the results for Okon's B sample test would be known, Fennell replied: "We have been informed that the athlete is waiving the right to the B sample (test) but this has yet to be confirmed.
"We will confirm this at his hearing this afternoon."Reuse content