Aflac says that it has identified suspicious activity on its network in the U.S. 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 Friday that the intrusion was stopped within hours.

Aflac said Friday customer health data and Social Security numbers were hacked, but that it stopped the cyber intrusion within hours and the attack did not include ransomware.

Officials with Aflac have confirmed that hackers breached the insurance giant with social security numbers, insurance claims and health information being possibly stolen, according to company officials.