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.

FBI officials informed agents nationwide that details about their use on the telecom carrier's network were likely among billions of records stolen, the report said, adding that w

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

Hackers who breached AT&T's systems may have handed criminals a roadmap to FBI informants, stealing call logs that could unravel investigations and jeopardize lives, according to alarming new details revealed Thursday.

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

FBI leaders have warned that hackers who breached AT&T’s system last year likely stole months of agents’ call and text logs, prompting an urgent effort to safeguard confidential informants’ identities,