The Current UK Threat Level from International Terrorism is SEVERE
Current threat level. The system of threat levels has been created to keep you informed about the level of threat the UK faces from terrorism at any given time.
Threat from international terrorism - The current threat level is severe, this means that an attack is highly likely.
Threat from Northern Ireland-related terrorism. The current threat level is set separately for Northern Ireland and Great Britain: In Northern Ireland it is Severe - this means that a terrorist attack is highly likely. In Great Britain it is Moderate - this means that a terrorist attack is possible but not likely.
What are threat levels? The system of threat levels has been created to keep you informed about the level of threat the UK faces from terrorism at any given time. This system helps police and other law enforcement agencies decide how to allocate staff. The threat level represents the likelihood of an attack in the near future.
The five levels are:
critical - an attack is expected imminently
severe - an attack is highly likely
substantial - an attack is a strong possibility
moderate - an attack is possible but not likely
low - an attack is unlikely
Who decides the threat levels? The Security Service (MI5) is responsible for setting the threat level from terrorism related to Northern Ireland, both in Northern Ireland and in Great Britain. The Joint Terrorism Analysis Centre (JTAC) is responsible for setting the threat level from international terrorism. To do this, they consider information gathered through intelligence in the UK and abroad. They also consider how terrorist organisations have behaved in the past. In some cases, counter-terrorism officials have to use their best judgement when deciding just how close a terrorist group might be to staging an attack. Threat levels do not have an expiry date, and can be revised at any time as the information available to security agents' changes.
Text courtesy of the Home Office