Multiple US telecom providers were targeted in a breach by Chinese hackers, according to the FBI and CISA.

Government and political figures' call record data was stolen by malicious actors who accessed cellphone customers' records.

Commercial telecommunication service providers in the U.S. were breached by PRC hackers, according to the FBI and CISA.

Agencies are proactively alerting other potential targets of elevated cyber activity after breached entities have been warned.

A joint release from government agencies on Wednesday revealed that the U.S. government's investigation into the PRC's targeting of commercial telecommunications infrastructure has uncovered a significant cyber espionage campaign.

FBI seal — The FBI and the Cybersecurity and Infrastructure Security Agency (CISA) say Chinese hackers breached commercial telecommunication service providers in the U.S. (Chip Somodevilla/Getty Images)

The telecommunications companies' networks have been compromised by PRC-affiliated actors, resulting in the theft of customer call record data and private communications of a limited number of individuals involved in government or political activity, according to the agencies.

The PRC actors also obtained "certain information that was subject to U.S. law enforcement requests pursuant to court orders," according to the joint statement.

As the investigation progresses, our comprehension of these compromises will increase, the agencies stated.

The U.S. government is investigating China for targeting commercial telecommunications infrastructure in America. (CISA)

The agencies are working to enhance their cybersecurity measures and urged affected organizations to contact their local FBI field office or CISA.

"The FBI and CISA are providing technical assistance, quickly sharing information, and working to enhance cybersecurity defenses in the commercial communications sector. They urge any potential victims to contact their local FBI Field Office or CISA."

Chinese flag — The reports of continued Chinese interference in the U.S. come after hackers targeted the Trump and Harris presidential campaigns. (Paul Yeung/Bloomberg via Getty Images)

After hackers targeted President-elect Trump and Vice President Kamala Harris' campaigns during the presidential race, reports of continued Chinese interference in the U.S. have emerged.

The FBI and CISA promptly informed affected companies of malicious activity targeting the sector, provided technical assistance, and rapidly shared information to help other potential victims, as previously stated by the FBI and CISA to Planet Chronicle Digital.

Planet Chronicle Digital has reached out to the FBI for comment.