Two Kenyan athletes have been excluded from the ongoing world athletics championships in Beijing over suspicion of doping rules violations. Kenya's new 400 meters record holder Joy Zakari was omitted from the semifinals of the women's race on Tuesday evening and technically given a DID NOT START. It is alleged that she may have failed a drugs test, thought to be a masking agent for the banned substance, Nandrolone. Another Kenyan sprinter Francesca Koki Manunga is also alleged to have failed a doping test immediately after running the 400m women's heat on Sunday. She failed to progress to the semifinals and has since been provisionally excluded from further activities in the championships. Kenyan officials in Beijing have acknowledged engaging the IAAF on the issue, but have declined to give further comment.