A woman walks by an AT&T logo at AT&T Discovery District in downtown Dallas, Thursday, Feb. 22, 2024, in Dallas.

A woman walks by an AT&T logo at AT&T Discovery District in downtown Dallas,Thursday, Feb. 22, 2024, in Dallas. (Chitose Suzuki/The Dallas Morning News/TNS)

Dallas-based telecommunications company AT&T revealed its second data breach of the year Friday morning, a leak that affects more than 100 million U.S. customers.

The cause of the breach was not a breakdown of company servers, the company said, but a malicious actor who illegally broke into an AT&T workspace from a remote platform. The data compromised contains communication records from May 1 to Oct. 31, 2022, as well as on Jan. 2, 2023. The concerned data was not taken on those dates, but from those dates after the fact.

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