Anchorage, Alaska (KINY) Letters were mailed from the state Division of Public Assistance to Alaska residents possibly affected.
KTVA News reported a virus infected one of the division's computers in late April 2018. Officials have not found signs that data was compromised.
The state Department of Health and Social Services said the division's eligibility database might have been compromised due to "unauthorized access by unknown cyber attackers."
The division computer affected by the breach accessed sites in Russia, had unauthorized software installed and other suspicious computer behavior.
The FBI is still investigating the matter. State officials in the meantime changed security procedures.