The U.S. Treasury Department on Friday imposed sanctions on alleged hacker Yin Kechen 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 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

The Treasury Department on Friday sanctioned Chinese firm Sichuan Juxinhe Network Technology Co. and Shanghai-based hacker Yin Kecheng for their roles in major hacks that allowed access to sensitive,