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,

China-affiliated hackers have compromised US officials’ data through a large-scale hack on telecommunications providers, according to the US government. The FBI and the US Cybersecurity and Infrastructure Security Agency (CISA) published a joint advisory on November 13 in which they shared more details on what they called “a broad and significant cyber espionage campaign.