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The National Terrorism Advisory System (NTAS) Alerts

After reviewing the available information, the secretary of Homeland security will decide, in coordination with other Federal entities, whether an NTAS alert should be issued. 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.

Imminent Threat Alert - Warns of a credible, specific, and impending terrorist threat against the U.S.

Elevated Threat Alert - Warns of a credible terrorist threat against the U.S.

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 - 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.

Sunset Provision - An individual threat alert is issued for a specific time period and then automatically expires. It may be extended if new information becomes available or the threat evolves.

Terrorism Information
Terrorism information and intelligence is based on the collection, analysis and reporting of a range of sources and methods. While intelligence may indicate that a threat is credible, specific details may still not be known. As such, Americans should continue to stay informed and vigilant throughout the duration of an NTAS Alert.

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. During an alert, stay vigilant and if you see something suspicious report it to local law enforcement or call 911 (or equivalent).

Alert Announcements
NTAS alerts will be issued through state, local and tribal partners, the news media and directly to the public via the following channels:

· Via the official DHS NTAS webpage - http://www.dhs.gov/alerts  
· Via email signup at - http://www.dhs.gov/alerts  
· Via social media
· facebook - http://facebook.com/ntasalerts    
· twitter - http://www.twitter.com/ntasalerts   
· Via data feeds, web widgets and graphics
The public can also expect to see alerts in places, both public and private, such as transit hubs, airports and government buildings.

Contact your local or Installation's Office of Emergency Management for more information.