The carrier joins a growing list of known victims, including AT&T and Verizon, of the major Chinese spying operation.

T-Mobile US Inc.’s network was among those recently breached by Chinese hackers in an attack on multiple telecommunications companies, the Wall Street Journal reported.

Mobile's network was among the systems hacked in a damaging Chinese cyber-espionage operation that successfully gained entry into multiple U.S. and international telecommunications companies, The Wall Street Journal reported on Friday citing people familiar with the matter.

The FBI has confirmed that Chinese hackers were responsible for a series of telecommunication breaches that may have lasted months.

Chinese-linked hackers accessed surveillance data meant for U.S. law enforcement after infiltrating the networks of several telecom companies, according to a statement from U.S. authorities on Wednesday.