MONACO — Japan’s Koki Ikeda, an Olympic silver medalist in the race walker, has been provisionally suspended on suspicion of blood doping, the Athletics Integrity Unit announced Friday.

Ikeda finished second in the 20 kilometer event at the 2021 Tokyo Olympics and seventh at the Paris Olympics three months ago.

The 26-year-old walker was informed of a charge based on suspicious readings of his biological passport, the AIU said. The passport can show markers of doping over time without an athlete testing positive for a banned drug.

Investigators gave no timetable for the disciplinary case.

Ikeda also won silver at the 2022 world championships in Eugene, Oregon.