Sources: Salt Typhoon hackers still had access to some parts of US broadband networks within the last week, and investigators don’t know what they were seeking (Wall Street Journal)

Wall Street Journal:
Sources: Salt Typhoon hackers still had access to some parts of US broadband networks within the last week, and investigators don't know what they were seeking  —  In letters to AT&T, Verizon and Lumen, lawmakers ask about proposed measures the companies will take to protect U.S. wiretap systems