The threat level indicates the likelihood of a terrorist attack in the UK.

There are 5 levels of threat:

• 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

The current threat level is set separately for Great Britain and Northern Ireland.

In mainland Britain, the threat level is substantial from international terrorism and moderate from Northern Ireland-related terrorism.

In Northern Ireland, the threat level is substantial from international terrorism and severe from Northern Ireland-related terrorism.

The level is set by the Joint Terrorism Analysis Centre and the Security Service (MI5).

Threat levels don’t have an expiry date. They can change at any time as different information becomes available to security agents.

More information about terrorist threat levels

Get more information about terrorism threat levels in the UK on the MI5 website.

You can also check the government’s travel advice for different countries.

The Security Service (MI5) is responsible for protecting the UK against threats to national security.

The Office for Security and Counter-Terrorism coordinates the government’s response in case of a terrorist incident.

Counter-terrorism laws are enforced by the police.

Public safety

The government will issue a warning to the public if that's the best way to protect a community or a place facing a specific threat.

If you suspect someone is involved in terrorism in any way:

• contact the police
• report suspicious activity to MI5
• report online terrorist material

You can remain anonymous.

National Risk Register

The government regularly assesses the natural hazards and man-made threats that could affect the UK.

These are published in the National Risk Register. This explains the likelihood of a risk occurring and possible effects of an emergency if it happens.

Local and central government preparations

Your local council, fire, police and ambulance services and other organisations take part in regular training exercises to prepare for emergencies.

Find out how emergencies are planned for in your area.

You can also read guidance for local councils on recovery after an emergency.

There are also government plans to make sure essential services, like food, water, transport, health and financial services, keep working in the event of an emergency.