FBI, CISA say Chinese hackers breached multiple US telecom providers in targeted attack

"The U.S. government's continued investigation into the People's Republic of China (PRC) targeting of commercial telecommunications infrastructure has revealed a broad and significant cyber espionage campaign," the agencies said Wednesday in a joint release.

The agencies said that PRC-affiliated actors have compromised networks at multiple telecommunications companies to enable the theft of customer call record data, as well as private communications of a "limited number of individuals who are primarily involved in government or political activity."

"We expect our understanding of these compromises to grow as the investigation continues," the agencies noted.

The agencies said that they are working to "strengthen cyber defenses," and encouraged organizations that believe they were impacted to contact their local FBI field office or CISA.

"After the FBI identified specific malicious activity targeting the sector, the FBI and the Cybersecurity and Infrastructure Security Agency (CISA) immediately notified affected companies, rendered technical assistance, and rapidly shared information to assist other potential victims," the FBI and CISA previously told Fox News Digital in a joint statement.

Fox News Digital has reached out to the FBI for comment.