NPR: Department of Homeland Security to unveil new national alert system for terrorism.
NPR: Department of Homeland Security to unveil new national alert system for terrorism.
The department used to have a color-coded terror alert system that was put into place after Sept. 11, but that was replaced by the National Threat Advisory System (NTAS) in 2011.
Johnson said NTAS has never been used because it sets too high a bar, namely that it depends on there being a specific, credible threat to the homeland.
