French authorities say former IAAF President Lamine Diack has been placed under investigation on corruption and money-laundering charges.

Diack, who stepped down in August after 16 years in charge of track and field's governing body, is suspected of taking money from Russia to hide positive doping tests.

The French office that handles financial prosecutions says a legal adviser to Diack, Habib Cisse, also was placed under investigation by judges acting on evidence provided by the World Anti-Doping Agency.

The office also says that Gabriel Dolle, who was the director of the IAAF's anti-doping department, has been taken into custody in the south of France.