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.
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.[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]
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
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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
