Anti-doping agency says athlete data stolen by Russian group

A woman walks into the head office for the World Anti-Doping Agency (WADA) in Montreal, Quebec, Canada on November 9, 2015. REUTERS/Christinne Muschi/File Photo

(Reuters) - The World Anti-Doping Agency said on Tuesday that hackers stole confidential medical information about U.S. Olympic athletes and published it on the internet, blaming a Russian group for the attack.

The U.S. government is investigating the case because there is evidence that the hackers are linked to the Russian government, though details are still sketchy, according to two sources familiar with the probe who were not authorized to publicly discuss the matter.