LONDON, April 29 (Xinhua) -- Greece's Athanasia Tsoumeleka, the 2004 Olympic 20km walk champion, tested positive for the blood booster CERA at last year's Beijing Games, sources close to the International Olympic Committee (IOC) investigation said.

Tsoumeleka, 27, who finished ninth in Beijing, was a surprise winner in Athens after finishing only seventh in the Paris world championships in the previous year.

Tsoumeleka was one of the six athletes who had tested positive for CERA after the IOC re-tested their samples.

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