CBS News has learned that the FBI is investigating allegations surrounding the Russian doping scandal.

On Sunday, "60 Minutes" reported that the former director of the drug testing lab at the Sochi Winter Olympics knew of at least four Russian gold medalists who were using performance enhancing drugs.

World Anti-Doping Agency spokesman Ben Nichols said Monday officials from the agency watched the "60 Minutes" report, "which revealed new and very disturbing allegations regarding Russian doping in sport. We will look into these without delay."

Russian Sports Minister Vitaly Mutko on Monday dismissed the new allegations as speculation.


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