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AT&T is investigating a significant data leak that has affected approximately 73 million current and former account holders. The company disclosed this breach, which involves around 7.6 million active customers and 65.4 million individuals who no longer hold accounts with the company. The data, which found its way to the dark web this month, appears to stem from a 2019 dataset or earlier.

According to AT&T, there’s no evidence to suggest that the company’s systems were unauthorizedly accessed in relation to the recent leak. The ongoing investigation into the source of the data leak includes internal and external cybersecurity experts and the FBI. As of now, it remains unclear whether the data originated directly from AT&T or one of its third-party vendors.

Despite the scale of the breach, AT&T said the incident has not significantly disrupted its operations. AT&T also said they were proactively reaching out to affected customers, offering credit monitoring services to help safeguard their financial information and identity.

This leak follows closely on the heels of last month’s widespread service outage, which affected users nationwide, disrupting wireless connections. That incident led to an extensive federal investigation by the Federal Communications Commission (FCC), the Department of Homeland Security (DHS), and the FBI. In response to the outage, AT&T offered a $5 credit to those impacted, acknowledging the inconvenience caused.