Aflac says it has identified suspicious activity on its network in the United States that may impact Social Security numbers and other personal information, calling the incident part of a cybercrime campaign against the insurance industry.

The company said that the intrusion was stopped within hours.

“We continue to serve our customers as we respond to this incident and can underwrite policies, review claims, and otherwise service our customers as usual,” Aflac said in a statement.

The company said that it’s in the early stages of a review of the incident, and so far is unable to determine the total number of affected individuals.

Aflac Inc. said potentially impacted files contain claims information, health information, Social Security numbers and other personal information, related to customers, beneficiaries, employees, agents and other individuals in its U.S. business.

The Columbus, Ga., company said it will offer free credit monitoring and identity theft protection and Medical Shield for 24 months to anyone who calls its call center.