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National Terrorism Advisory System:

The National Terrorism Advisory System, or NTAS, replaces the five tiered, color-coded Homeland Security Advisory System (HSAS) with a two category system.

Elevated Threat Alert
Warns of a credible terrorist threat against the United States

Imminent Threat Alert
Warns of a credible, specific, and impending terrorist threat against the United States.

This new system will more effectively communicate information about terrorist threats by providing timely, specific 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.

NTAS Alerts will only be issued when credible information is available.

These alerts will include a clear statement that there is an imminent threat or elevated threat. Using available information, the alerts will provide a concise summary of the potential threat, information about actions being taken to ensure public safety, and recommended steps that individuals, communities, businesses and governments can take to help prevent, mitigate or respond to the threat.

The NTAS Alerts will be based on the nature of the threat: in some cases, alerts will be sent directly to law enforcement or affected areas of the private sector, while in others, alerts will be issued more broadly to the American people through both official and media channels.

NTAS Alerts contain a sunset provision indicating a specific date when the alert expires, which means there will not be a constant NTAS Alert or blanket warning that there is an overarching threat. If threat information changes for an alert, the Secretary of Homeland Security may announce an updated NTAS Alert. All changes, including the announcement that cancels an NTAS Alert, will be distributed the same way as the original alert.

Below is a sample of the National Terrorism Advisory System Alert: