UK Terrorrism Threat Levels

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
Date	Threat from international 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)