The National Terrorism Advisory System, or NTAS, replaced the color-coded Homeland Security Advisory System (HSAS) in April, 2011. The NTAS system effectively communicates 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.

This page also contains any current NTAS Alerts and archived copies of expired alerts.

The NTAS Alert – How can you help?

Each alert provides information to the public about the threat, including, if available, the geographic region, mode of transportation, or critical infrastructure potentially affected by the threat; protective actions being taken by authorities, and steps that individuals and communities can take to protect themselves and their families, and help prevent, mitigate or respond to the threat.

Citizens should report suspicious activity to their local law enforcement authorities. The “If You See Something, Say Something^TM” campaign across the United States encourages all citizens to be vigilant for indicators of potential terrorist activity, and to follow NTAS Alerts for information about threats in specific places or for individuals exhibiting certain types of suspicious activity.

Learn More

• NTAS Public Guide
• NTAS Frequently Asked Questions
• Sample NTAS Alert

Action Center

• NTAS Alerts via Email
• NTAS Alerts via Facebook
• NTAS Alerts via Twitter
• NTAS For Your Website (Data feeds, web widgets and graphics)