Understanding the Homeland Security Advisory System
The world has changed since September 11, 2001. We remain a nation at risk to terrorist attacks and will remain at risk for the foreseeable future. At all Threat Conditions, we must remain vigilant, prepared, and ready to deter terrorist attacks.
About the Homeland Security Advisory System
The Homeland Security Advisory System (HSAS) is designed to target our protective measures when specific information to a specific sector or geographic region is received. It combines threat information with vulnerability assessments and provides communications to public safety officials and the public.
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.
It recognizes that Americans all share responsibility for the nation's security, and should always be aware of the heightened risk of terrorist attack in the United States and what they should do.
Current Threat Level Information