Aflac, which provides supplemental insurance to around 50 million individuals whose expenses are not covered by their primary providers, said it was not yet known how many customers are affected by the data breach but that the personal data includes customers' claims,

Aflac recently revealed that hackers stole its customers' data in a cyberattack. Details remain scarce, but the company says it "was caused by a sophisticated cybercrime group" that's targeting the insurance industry.

Insurance company Aflac disclosed this week that cybercriminals breached its U.S. network and may have accessed customers’ personal information, the latest in a string of cyberattacks on insurance companies announced this month.