Hackers are trying to tarnish the U.S. Olympic team by releasing documents they claim show athletes — including gymnast Simone Biles and tennis players Venus and Serena Williams — used illegal substances during the Rio Games.

The medical files, allegedly from the World Anti-Doping Agency, were posted Tuesday on a site bearing the name of the hacking group Fancy Bears. “Today we’d like to tell you about the U.S. Olympic team and their dirty methods to win,” said a message on the hackers’ site.

The World Anti-Doping Agency confirmed it had been hacked and blamed Fancy Bears, a Russian state-sponsored cyber espionage team that is also known as APT 28 — the very same group that may have recently breached the Democratic National Committee.

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