The Treasury Department has announced sanctions in connection with a massive Chinese hack of American telecommunications companies and a breach of its own computer network.

The Biden administration on Friday announced sanctions on two Chinese entities accused of cyberattacks, including a firm it said is directly involved in the recent espionage campaign against US telecommunications firms and a hacker behind the recent breach of Treasury Department computers.

State-sponsored Chinese hackers breached U.S. Treasury Secretary Janet Yellen’s computer, accessing thousands of unclassified documents in December, anonymous sources told