The U.S. Treasury Department on Friday imposed sanctions on alleged hacker Yin Kecheng and cybersecurity company Sichuan Juxinhe Network Technology Co., accusing both of being involved in a series of hacks against American telecom companies.

The Treasury Department announced sanctions Friday 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 who was involved in a cyber-intrusion

US Treasury Secretary Janet Yellen’s computer was infiltrated and unclassified files were accessed as part of a broader breach of the agency by Chinese state-sponsored hackers, according to two people familiar with the matter.

The U.S. Treasury department on Friday issued cyber-related sanctions related to the Salt Typhoon hack on Singaporean Yin Kechen and cybersecurity company Sichuan Juxinhe Network Technology Co., according to a statement.

The State and Treasury Departments say Chinese cybersecurity vendor Sichuan Juxinhe is behind the hacks into numerous US telecommunications companies.

The U.S. Treasury Department said Sichuan Juxinhe Network Technology Co. was directly involved in the deep compromises of the telecommunications firms.

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.