Britain's Paula Radcliffe protested against tainted Russian runner Olga Yegorova before the start of the 5,000 metres heats in the World Championships.
Radcliffe was angry that Yegorova was allowed to compete in the championships following her recent drugs furore. She sat in stadium in the seats allocated to the British athletes and held up a banner that read: "EPO cheats out".
Radcliffe said: "We decided the girls in the race should not have to make a protest, they should be able to concentrate on the race. So we decided to make our protest here instead.
"To all intents and purposes she [Yegorova] had failed an EPO test and she should not be racing here".
Yegorova was originally suspended after she tested positive for the banned hormone erythropoetin (EPO) following a meet in Paris on July 6th.
The IAAF was forced to lift her suspension, however, on a technicality because the French laboratory tested only her urine not her blood.
Romanian world and Olympic champion Gabriela Szabo originally threatened to boycott the race if Yegorova was allowed to compete, but she backed down "for the sake of my fans" and agreed to run.
Yegorova finished second in the race, with Szabo fourth, which means both women qualify automatically for the next round.
PA