Information tied to customers’ insurance claims and personal data may also have been breached in the cyberattack, Aflac said. “We regret that this incident occurred,” Aflac said. “We will be working to keep our stakeholders informed as we learn more and continue investigating the incident.”

Health and life insurer Aflac on Friday said it is investigating a breach on its U.S. network that may have exposed customers' personal information, making it the latest insurance provider to be targeted in a cyberattack.

It’s the largest insurance company yet to fall victim to a major hacking, with tens of millions of customers and a $55 billion market cap.