Current UK Threat Level Critical (23rd May 2017)
What the threat levels mean
Threat levels are designed to give a broad indication of the likelihood of a terrorist attack.
- LOW means an attack is unlikely.
- MODERATE means an attack is possible, but not likely
- SUBSTANTIAL means an attack is a strong possibility
- SEVERE means an attack is highly likely
- CRITICAL means an attack is expected imminently
Threat level history
Since 2006, information about the national threat level has been available on the MI5 and Home Office websites. In September 2010 the threat levels for Northern Ireland-related terrorism were also made available.
| Date | Threat from international terrorism | Threat from Northern Ireland-related terrorism | |
| in Northern Ireland | in Great Britain | ||
| 23 May 2017 | CRITICAL | SEVERE | SUBSTANTIAL |
| 11 May 2016 | SEVERE | SEVERE | SUBSTANTIAL |
| 29 August 2014 | SEVERE | SEVERE | MODERATE |
| 24 October 2012 | SUBSTANTIAL | SEVERE | MODERATE |
| 11 July 2011 | SUBSTANTIAL | SEVERE | SUBSTANTIAL |
| 24 September 2010 | SEVERE | SEVERE (first published) | SUBSTANTIAL (first published) |
| 22 January 2010 | SEVERE | ||
| 20 July 2009 | SUBSTANTIAL | ||
| 4 July 2007 | SEVERE | ||
| 30 June 2007 | CRITICAL | ||
| 13 August 2006 | SEVERE | ||
| 10 August 2006 | CRITICAL | ||
| 1 August 2006 | SEVERE (first published) | ||
