The World Anti-Doping Agency (WADA) stated Tuesday a "Russian cyber espionage group" identified as Fancy Bear, hacked into its database and revealed medical information regarding some American athletes, per the Associated Press (via NBC Sports).
"These criminal acts are greatly compromising the effort by the global anti-doping community to re-establish trust in Russia," WADA director general Olivier Niggli said.
In a statement on their official website, WADA identified the data the hackers targeted:
The group accessed athlete data, including confidential medical data -- such as Therapeutic Use Exemptions delivered by International Sports Federations (IFs) and National Anti-Doping Organizations (NADOs) -- related to the Rio Games; and, subsequently released some of the data in the public domain, accompanied by the threat that they will release more.