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Terror alert system: Wikis


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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.



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.


Plan Vigipirate

  • Yellow - to stress vigilance
  • Orange - to warn of terrorist action
  • Red - to warn of serious attempts
  • Crimson - to warn of major attempts

United Kingdom

UK Threat Level

  • Low - an attack is unlikely
  • Moderate - an attack is possible, but not likely
  • Substantial - an attack is a strong possibility
  • Severe - an attack is highly likely
  • Critical - an attack is expected imminently

Administered by the Joint Terrorist Analysis Centre

United States

Homeland Security Advisory System

  • Low - Low risk of terrorist attacks
  • Guarded - General risk of terrorist attacks
  • Elevated - Significant risk of terrorist attacks
  • High - High risk of terrorist attacks
  • Severe - Severe risk of terrorist attacks

Administered by the Department of Homeland Security


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