Jamaica’s 200 metres world champion Veronica Campbell-Brown has tested positive for a banned diuretic, sources close to Jamaican athletics told Reuters.

The sources said the doping violation occurred at the Jamaica International Invitational meeting on May 4 in Kingston.

Campbell-Brown, who won the Olympic 200 metres title in 2004 and 2008, is Jamaica’s most successful female athlete and the biggest name in track and field to fall foul of the drug testers since disgraced American sprinter Marion Jones.