Monaco - Kenyan distance runner Cyrus Rutto has been provisionally suspended in a doping case.
The IAAF's Athletics Integrity Unit says it has charged the 26-year-old Rutto with "use of a prohibited substance or method" based on evidence from his biological passport.
Rutto is currently ranked 15th in the world in the 5 000m race.
He represented Kenya at the 2017 world championships in London, where he finished 13th in the 5 000 final.
Rutto was not selected for Kenya's team at the 2016 Rio de Janeiro Olympics.