The breach, traced to Chinese state-sponsored hackers, may have lasted for months, according to The Wall Street Journal.

Multiple U.S. broadband providers, including Verizon, AT&T, and Lumen Technologies, have been breached by a Chinese hacking group tracked as Salt Typhoon, the Wall Street Journal reports.

Chinese hackers were in networks of major ISPs “for months,” WSJ reports.

The China-linked group Salt Typhoon hacked AT&T and Verizon, possibly compromising wiretap systems, according to WSJ.

The cyberattack acccessed systems used for court-authorized wiretaps to collect internet traffic from millions of Americans.

The intrusion affected major telecom company networks that cooperate with court-authorized U.S. requests for communications data, according to a recent report.

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Hackers tied to the Chinese government compromised the law enforcement wiretap network of U.S. telecom companies, and security analysts aren't sure how bad it is yet.