A Jamaican track and field athlete has committed a doping violation, the island nation's anti-doping commission said on Thursday, just days before the country was to name its world championship team.
"The Jamaica Anti-Doping Commission (JADCO) has received an adverse analytical finding from a sample collected at the Jamaica national trials on June 24, 2011," the commission said in a statement.
It would not name the athlete nor the substance.
Sources indicated the athlete was neither double sprint world record holder Usain Bolt nor former 100 metres record holder Asafa Powell.
The athlete with the violation did not win an individual medal at the 2009 world championships in Berlin, the sources told Reuters.
Bolt won both the 100 and 200 metres with world-record runs at the championships. Powell earned bronze in the 100 metres.
With Bolt and Powell leading the way, Jamaican sprinters are again expected to play a dominant role in the Aug. 27-Sept. 4 world championships in Daegu, South Korea.
"JADCO is unable to release any detail on the athlete and the nature of the violation until the results management process has been completed," the anti-doping commission said.
The Jamaica Athletics Administrative Association (JAAA) confirmed it had been notified of a violation.
"I can say we have received a letter from JADCO," Warren Blake, chairman of JAAA's medical and anti-doping committee, told Reuters.
"But further than that, I cannot really say much because as you know, these processes are confidential until after the 'B' sample has been tested."