The outgoing head of the Federal Communications Commission said a massive Chinese-linked cyber-espionage operation against U.S. telecoms firms known as "Salt Typhoon" is a "clarion call" to address significant telecommunications security issues.

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

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.