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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

• Certain - terrorist attack is imminent or has occurred
• Expected- terrorist attack is highly likely
• Probable - terrorist attack is likely
• Possible - terrorist attack could occur
• Low - terrorist attack is not expected

Administered by the Federal Attorney-General's Department.

France

Plan Vigipirate

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

Ireland (Republic of)

International Terror Threat Level

• Low: An attack is deemed 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 imminent or has occurred.

Administered by the Garda Síochána.

Since November 2015, the international terrorism threat level is considered to be at moderate, meaning an attack is "possible but not likely".

Netherlands

Russia

• Blue - an unconfirmed information about real terroristic threat
• Yellow - a confirmed information about real terroristic threat
• Red - an information about committed terrorist act

United Kingdom

• 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 or has occurred

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

National Terrorism Advisory System

• Elevated Threat - Significant or high risk of terrorist attacks
• Imminent Threat - Critical risk of terrorist attacks

References

1. O'Keeffe, Cormac (2 May 2016). "What is the reality of the threat posed by Islamic extremists in Ireland?". Irish Examiner. Archived from the original on 3 May 2016. Retrieved 11 May 2016.
2. "Terror threat level unaffected by attacks". Irish Independent. 27 June 2015. Archived from the original on 25 September 2015. Retrieved 1 July 2015.
3. Williams, Paul; Brady, Tom (24 November 2015). "Units to counter terrorism step up training". Irish Independent. Archived from the original on 25 November 2015. Retrieved 24 November 2015.
4. УРОВНИ ТЕРРОРИСТИЧЕСКОЙ ОПАСНОСТИ | Национальный антитеррористический комитет(in Russian)

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