# Terror alert system

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**Terror alert systems** are standardised [emergency population warning](/source/Emergency_population_warning) systems for describing and disseminating information about [terrorism](/source/Terrorism)-related threats. They became more popular after the [September 11 attacks](/source/September_11,_2001_attacks) on the [United States](/source/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](/source/Attorney-General's_Department_(Australia)).

## France

Main article: [Vigipirate](/source/Vigipirate)

**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](/source/Garda_S%C3%ADoch%C3%A1na).[1]

Since November 2015, the international terrorism threat level is considered to be at moderate, meaning an attack is "possible but not likely".[2][3]

## Netherlands

Main article: [Nationaal Coördinator Terrorismebestrijding en Veiligheid](/source/Nationaal_Co%C3%B6rdinator_Terrorismebestrijding_en_Veiligheid)

## Russia

- **Blue** - an unconfirmed information about real terroristic threat[4]
- **Yellow** - a confirmed information about real terroristic threat
- **Red** - an information about committed terrorist act

## United Kingdom

Main article: [UK Threat Levels](/source/UK_Threat_Levels)

- **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](/source/Joint_Terrorist_Analysis_Centre)

## United States

**Homeland Security Advisory System**

Main article: [Terror Alert Level](/source/Terror_Alert_Level)

- **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](/source/Department_of_Homeland_Security)

**[National Terrorism Advisory System](/source/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?"](https://web.archive.org/web/20160503110420/http://www.irishexaminer.com/viewpoints/analysis/what-is-the-reality-of-the-threat-posed-by-islamic-extremists-in-ireland-396021.html). Irish Examiner. Archived from [the original](http://www.irishexaminer.com/viewpoints/analysis/what-is-the-reality-of-the-threat-posed-by-islamic-extremists-in-ireland-396021.html) on 3 May 2016. Retrieved 11 May 2016.

1. ["Terror threat level unaffected by attacks"](https://web.archive.org/web/20150925042026/http://www.independent.ie/irish-news/news/terror-threat-level-unaffected-by-attacks-31333802.html). Irish Independent. 27 June 2015. Archived from [the original](http://www.independent.ie/irish-news/news/terror-threat-level-unaffected-by-attacks-31333802.html) on 25 September 2015. Retrieved 1 July 2015.

1. Williams, Paul & Brady, Tom (24 November 2015). ["Units to counter terrorism step up training"](http://www.independent.ie/irish-news/units-to-counter-terrorism-step-up-training-34228317.html). Irish Independent. [Archived](https://web.archive.org/web/20151125133921/http://www.independent.ie/irish-news/units-to-counter-terrorism-step-up-training-34228317.html) 25 November 2015 at the Wayback Machine. Retrieved 24 November 2015.

1. [УРОВНИ ТЕРРОРИСТИЧЕСКОЙ ОПАСНОСТИ | Национальный антитеррористический комитет](http://nac.gov.ru/urovni-terroristicheskoy-opasnosti.html)(in Russian)

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Adapted from the Wikipedia article [Terror alert system](https://en.wikipedia.org/wiki/Terror_alert_system) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Terror_alert_system?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.