The National Terrorism Advisory System is a terrorism threat advisory scale used by the Department of Homeland Security since April 2011. This system was established after the events of September 11, 2001, as a way of informing the public of any threats to our nation. It was first recognized as a color coded system, displaying different colors that represented different threat levels. It was later changed to this current style so that more information could be available for each threat that existed.
The National Terrorism Advisory System is a terrorism threat advisory scale used by the Department of Homeland Security since April 2011. This system was established after the events of September 11, 2001, as a way of informing the public of any threats to our nation. It was first recognized as a color coded system, displaying different colors that represented different threat levels. It was later changed to this current style so that more information could be available for each threat that existed.