Frost Bank reported unauthorized access to images of scanned documents that may affect area residents.

Customers of New Braunfels Utilities as well as Comal County residents who have made payments by mail-in check are urged to monitor bank accounts for fraudulent activity. Online and in-person payments are not affected by the breach, officials said.

For Comal County, the breach affects customers who mailed check payments to P.O. Box 659480, San Antonio. For New Braunfels Utilities, the breach affects those who have mailed check payments to P.O. Box 660, San Antonio.

Representatives from both entities said they will notify customers as they are made aware of additional details regarding the investigation.