General Immigration Resources from the Citizenship and Immigration Services Ombudsman's Office.
Frequently Asked Questions about NTAS.
The National Terrorism Advisory System, or NTAS, replaces the color-coded Homeland Security Advisory System (HSAS). This new system will more effectively communicate information about terrorist threats by providing timely, detailed information to the public, government agencies, first responders, airports and other transportation hubs, and the private sector. This public guide provides an overview of the NTAS system and how the public can help.