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AT&T has said that the nationwide service disruption experienced on Thursday was not the result of a cyberattack.

The company attributed the outage to “the application & execution of an incorrect process” amid network expansion efforts, according to a statement on X. They assured the public that an initial review led to this conclusion and that further assessments are underway to maintain the high service standards customers expect.

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Service was fully restored by Thursday evening, following reports of widespread disruptions that began in the morning. The outages, as tracked by DownDetector, primarily affected major cities such as Houston, Atlanta, Miami, and Chicago, peaking at over 70,000 reports around 8 AM.

The situation drew attention from federal agencies, with the Department of Homeland Security (DHS), the FBI, and the Federal Communications Commission (FCC) initiating investigations. White House National Security Adviser John Kirby emphasized the government’s involvement in assessing the outages, ensuring cooperation with network providers to support their investigative efforts. Kirby reassured the public, saying, “We’re going to look at this really hard,” and confirmed that based on AT&T’s findings, there was no indication of a cybersecurity incident.


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