Mwangi dismissed the claims as a "fabrication".
"WADA is most disturbed by these reports regarding extortion and bribery at the national level of sport," WADA Director General David Howman said in a statement.
He said they were "eerily similar sounding" to what had been learnt through a recent independent commission investigation into widespread doping in international athletics.
The report found that a clique run by former IAAF president Lamine Diack covered up organised doping and blackmailed athletes while senior officials looked the other way.
Diack is under formal investigation in France on suspicion of corruption and money-laundering linked to the concealment of positive drug tests in concert with Russian officials.
"WADA will of course require more detailed information on these allegations from those concerned so that we can determine if this is a matter for us to investigate or for the (IAAF) ethics commission as part of its own enquiries," Howman said of the latest claims.
"The allegations we have heard this week also illustrate the importance of having a robust, independent national anti-doping organisation fully functional in Kenya at the earliest opportunity," he added.
(Reporting by Alan Baldwin, editing by Nick Mulvenney)
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