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

The company said Friday 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 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 said potentially affected 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, Georgia-based company said it will offer free credit monitoring and identity theft protection and Medical Shield for 24 months to anyone that calls its call center.

Cyberattacks against companies have been rampant for years, but a string of attacks on retail companies has raised awareness of the issue because the breaches can affect customers.

A security breach detected by Victoria’s Secret last month led the popular lingerie seller to shut down its U.S. shopping site for nearly four days, as well as halt some in-store services. Victoria’s Secret later disclosed that its corporate systems also were affected, causing the company to delay the release of its first-quarter earnings.