Cyber criminals may have accessed claims information, health information, social security numbers, and/or other personal information.

A group of cybercriminals hacked into data systems at insurance company Aflac, possibly gaining access to sensitive information such as Social Security numbers and health reports, the company said on Friday.

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,