National Terrorism Advisory System
- 全国恐怖主义警报系统（全国恐怖主义警报系统是美国国土安全部自2011年4月27日使用的恐怖主义威胁警报系统，分为两个级别。该系统于2011年1月27日由国土安全部部长珍妮特·纳波利塔诺首次向公众宣布）
National Terrorism Advisory System
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abstract:
The National Terrorism Advisory System (NTAS) is a two-level terrorism threat advisory scale used by the United States Department of Homeland Security since April 26, 2011. The system was announced on January 27, 2011 by Secretary of Homeland Security Janet Napolitano during a speech at George Washington University.
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