WASHINGTON (Reuters) -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.

Chinese state-sponsored hackers have breached hundreds of devices at the US Treasury Department, according to a new report.

US announced sanctions over a massive Chinese hack of American telecommunications companies and a breach of its own computer network.

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,

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's Office of Foreign Assets Control (OFAC) has imposed sanctions against a Chinese cybersecurity company and a Shanghai-based cyber actor for their alleged links to the Salt Typhoon group and the recent compromise of the federal agency.

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.

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,