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Terror alert systems are standardised emergency population warning systems for describing and disseminating information about terrorism-related threats. They became more popular after the September 11 attacks on the United States in 2001. ==Australia== National Counter-Terrorism Alert Level * Low - terrorist attack is not expected * Medium - terrorist attack could occur * High - terrorist attack is likely * Extreme - terrorist attack is imminent or has occurred Administered by the Federal Attorney-General's Department. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Terror alert system」の詳細全文を読む スポンサード リンク
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