Five Jamaican athletes have tested positive for a banned substance, a Jamaican doping official said on Friday.

"I can confirm that five athletes tested positive for a minor substance, but a further announcement will be made," an official said on condition of anonymity.

The positive tests were returned during the national athletics championship in Kingston [ Images ] last month, the official said.

The source said none of the athletes were 'stars' at the Beijing [ Images ] Olympic Games [ Images ] last year.

Earlier on Friday, local media reported that three men and two women had failed tests at the Jamaican nationals.