The 2016 Olympic marathon champion Jemima Sumgong has tested positive for a banned substance in an out-of-competition drug test, the International Association of Athletics Federations announced Thursday.

Sumgong, 32, who was the first Kenyan woman to win an Olympic marathon, underwent an unannounced test that detected EPO. The test was conducted by the IAAF as part of a program supported by the World Marathon Majors (WMM) organization, the coalition of race organizations that put on the Tokyo, Boston, London, Berlin, Chicago, and New York City marathons.

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