UPDATE 1-Doping-Athens walk champion Tsoumeleka tests positive

LONDON, April 29 (Reuters) - Greece's 2004 Olympic 20 km walk champion Athanasia Tsoumeleka 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.

The sources told Reuters on Wednesday that Tsoumeleka was one of the six athletes who had tested positive for CERA after the IOC re-tested their samples. (Reporting by John Mehaffey; Editing by Sonia Oxley; to query or comment on this story: sportsfeedback@thomsonreuters.com)