AT&T, Verizon and Lumen are among the companies breached by Chinese hackers in a sophisticated intrusion by the group dubbed Salt Typhoon, officials say.

This includes AT&T, Verizon, and Lumen. Investigators suspect the hackers were looking for national security or other sensitive information.

A group of Chinese hackers infiltrated multiple US telecommunications firms in search for sensitive information on issues like national security, CNN reported citing multiple sources.The US investigators identified US broadband and internet providers AT & T,

A group of highly skilled Chinese hackers linked to the Chinese government successfully infiltrated multiple US telecommunications firms in the last few months, CNN reported.