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On January 27, 2011, Secretary of Homeland Security Janet Napolitano announced that DHS will discontinue the color-coded alerts of the Homeland Security Advisory System (HSAS) in favor of a new system, the National Terrorism Advisory System (NTAS), that 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.
The National Terrorism Advisory System will be implemented over the next 90 daysin order for DHS and our federal, state, local, tribal, community and private sector partners to transition to the new system.
Under the new system, DHS will coordinate with other federal entities to issue formal, detailed alerts when the federal government receives information about a specific or credible terrorist threat. These alerts will include a clear statement that there is an "imminent threat" or "elevated threat." The alerts also will provide a concise summary of the potential threat, information about actions being taken to ensure public safety, and recommended steps that individuals and communities, businesses and governments can take.
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—including a designated DHS webpage www.dhs.gov/alerts, as well as social media channels including Facebook http://www.facebook.com/homelandsecurityand via Twitter @NTASAlerts ttp://twitter.com/ntasalerts.
Additionally, NTAS will have a "sunset provision," meaning that individual threat alerts will be issued with a specified end date. Alerts may be extended if new information becomes available or if the threat evolves significantly.
For more information visit http://www.dhs.gov/index.shtm 
In the near future we will modify our OSP website to provide information on the new National Terrorism Advisory System (NTAS).