Federal authorities say an investigation into Chinese government hacking efforts has revealed a “broad and significant” cyberespionage campaign mounted by Beijing.

Hackers affiliated with Beijing have compromised the networks of “multiple” telecommunications companies to obtain customer call records and gain access to the private communications of “a limited number of individuals,

The U.S. government’s ongoing probe into China-backed actors’ attempts to hack into U.S. telecommunications infrastructure revealed a “broad and significant” espionage campaign targeted at those in government or political work,