A breach of AT&T that exposed “nearly all” of the company’s customers may have included records related to confidential FBI sources, potentially explaining the bureau’s new embrace of end-to-end encryption.

They believe hackers who broke into AT&T Inc.’s system last year stole months of their agents’ call and text logs.

The FBI has raised concerns over a significant data breach of ATTs (NYSE:T) systems last year, potentially exposing months of agents call and text logs. The breach, disclosed by Bloomberg News, compromised FBI

The FBI has issued a warning about a potential threat to its agents and confidential informants following a significant breach of AT&T Inc (NYSE:T).'s system last year. The hackers are believed to have stolen months of agents' call and text logs,