The United States Government introduced a security scale consisting of five color-coded threat levels. They are intended to reflect the probability of a terrorist attack.
Severe (red): severe risk
High (orange): high risk
Elevated (yellow): significant risk
Guarded (blue): general risk
Low (green): low risk
According to wikipedia, specific government actions triggered by different threat levels have not always been revealed to the public, although the government has provided general guidance for civilians and federal agencies. Actions have included increasing police and other security presence at landmarks and other high-profile targets, a closer monitoring of international borders and other points of entry, ensuring that emergency response personnel were ready, and, in some cases, deployment of members of the National Guard and State Guard to assist local law enforcement on security details.
The published terror alert notices have urged American citizens, especially those traveling in the transportation systems, to “be vigilant, take notice of their surroundings, and report suspicious items or activities to local authorities immediately.” In addition, DHS advises the public to prepare an emergency preparedness kit and a family emergency plan.
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