French magistrates have upgraded corruption charges against former IAAF president Lamine Diack in connection with the cover-up of Russian doping.
Diack is now accused of "active corruption" - having previously been charged with "passive corruption" - on suspicion of bribing Gabriel Dolle, the IAAF's former anti-doping chief who is also under investigation, to delay reporting of violations by Russian athletes.
The 82-year-old, who spent 16 years as the boss of world athletics, denies making the payments.
Diack was last month provisionally suspended from his position as an honorary member of the IOC and the IAAF then revealed he had stepped down as the president of the International Athletics Foundation.
He was replaced as IAAF president earlier this year by Sebastian Coe, who has vowed to clean up the sport.
Russia confirmed last month they will not appeal the IAAF decision to suspend the country from international competition and have agreed to comply fully with an international inspection team.
ARAF (All Russia Athletics Federation) was suspended in the aftermath of a World Anti-Doping Agency commission report alleging systematic doping and cover-ups over many years.