In a letter seen by AFP sent to the Senegalese President Macky Sall on November 16, Bach said that investigating magistrate, Renaud van Ruymbeke, "told us of the difficulties he has come up against in the execution of the two investigation letters addressed to the Minister of Justice of Senegal".
"The commitment of your government (...) would be particularly appreciated," added Bach, who asked that action be taken as quickly as possible.
Papa Massa Diack -- known as PMD -- is suspected of having received several million euros of bribes, either for sponsorship contracts or to favour the Rio and Tokyo nominations for the 2016 and 2020 Olympics.
Van Ruymbeke said that his request for PMD's bank records was a "dead letter".
The Senegalese judiciary previously conducted its own investigation and said it would not extradite one of its nationals.
He was charged at the time with taking millions of dollars to cover up failed Russian doping tests along with two other IAAF officials. In June he was also charged with favouring his son in negotiations over sponsorship and TV rights.
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