The FBI and CISA previously said they were investigating breaches by a China-backed hacking group inside several telecommunications providers, but had not said whether any data was stolen or whether the hackers accessed the systems used to fulfill legal wiretap requests.

The FBI and the Cybersecurity and Infrastructure Security Agency (CISA) said that People's Republic of China (PRC) hackers breached commercial telecommunication service providers ... networks at multiple telecommunications companies to enable the theft ...

An FBI investigation into reported hacks at AT&T and Verizon reveals 'a broad and significant cyber espionage campaign,' the agency says.

China-affiliated actors "have compromised networks at multiple telecommunications companies" to enable the theft of U.S. customer call records and access to the private communications of some individuals involved in government or politics,

WASHINGTON (Reuters) -China-linked hackers have intercepted surveillance data intended for American law enforcement agencies after breaking in to an unspecified number of telecom companies, U.S. authorities said on Wednesday.

Feds don't name Salt Typhoon, but describe Beijing band's alleged deeds The US government has confirmed there was "a broad and significant cyber espionage campaign" conducted by China-linked snoops against "multiple" American telecommunications providers' networks.