The Treasury Department on Friday announced sanctions in connection with a massive Chinese hack of American telecommunications companies and a breach of its own computer network.The sanctions target a Chinese hacker who officials say is affiliated with Beijing's Ministry of State Security and was involved in a cyberintrusion disclosed last month that gave hackers access to an untold number of Treasury Department workstations.

The Treasury Department imposes sanctions following a significant Chinese cyberattack on US telecom firms and its own network breach.

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.

U.S. Treasury Secretary Janet Yellen's computer was hacked and unclassified files were accessed as part of a broader breach of the Treasury Department by Chinese state-sponsored hackers, Bloomberg News reported on Thursday,

A cyberattack on the US Treasury Department by Chinese state-backed hackers compromised computers of senior officials, including Janet Yellen. The breach, stemming from a third-party provider vulnerability,