mr. rodchenkov says doped throughout the games and many of whom captured medals. >> woodruff: is mr. rodchenkov safe in the united states? i ask because you report that two of his former close colleagues back in russia died unexpectedly a few months ago, just within a few weeks of each other. >> that's correct. he departe departed in november. he fled to the united states fearing for his safety. he went to los angeles. we're not giving any specifics about his location beyond that. but two of his close colleagues from the anti-doping world did die unexpectedly, suddenly, in february within weeks of each other. >> woodruff: and just finally, rebecca, is the international olympic committee, is anyone investigating this now? >> we contacted the international olympic committee today. they said that they were worried about these very detailed allegations, and they called on wada, the world anti-doping agency, to act and to investigate his specific claims. wada, meanwhile, has had board meetings today in canada, and we have been unable to connect with any wada official by phone and to get sp