...全部警报系统 历史 警报级别 批评 实际使用 国土安全部警报系统 国土安全部警报系统（HSAS, Homeland Security Advisory System）是负责美国领土内社会公共..
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一个持续关注来源，国土安全报告系统（ Homeland Security Advisory System）处于 橙色威胁级别。
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"The Homeland Security Advisory System serves various audiences, notably state and local first preventers and first responders, numerous private sector entities and the American citizen and general public, " he said.
CNN: Experts question U.S. terror alert system
Homeland Security Secretary Janet Napolitano, at a Reuters Washington Summit in mid-October, acknowledged problems with the advisory system.
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