Story highlights Two Kenyan runners fail drugs tests at the World Athletics Championships

Koki Manunga, 21, Joyce Zakary, 29 are both 400 meter runners

Runners were tested at their team hotel

(CNN) Athletics' fight against the curse of doping suffered a setback Wednesday after two Kenyan athletes failed drugs tests.

The 21-year-old Koki Manunga and the 29-year-old Joyce Zakary -- who are both 400 meter runners -- were provisionally suspended by the International Association of Athletic Federations (IAAF) after returning positive samples on August 20 and 21 respectively at the World Championships in Beijing, China.

Joyce Zakary of Kenya

"These targeted tests were conducted by the IAAF at the athlete hotels during the pre-competition phase," said an IAAF statement.

"The IAAF will not discuss the details of the cases as they progress through the results management process."

As it launched its own investigation, Athletics Kenya (AK) said it had met with the IAAF and the two athletes.

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