PARIS — The authorities investigating Lamine Diack, the former president of the International Association of Athletics Federations, said Friday that one of his sons, Papa Massata Diack, was also “very active” in a “system of corruption” that sought to blackmail athletes with demands of money to cover up suspected doping.
The French prosecutor Eliane Houlette said that at least one of Diack’s sons approached the Turkish runner Asli Cakir Alptekin a few months after she won the gold medal in the 1,500 meters at the 2012 London Olympics and suggested she could pay to quash a positive doping test.