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

National threat level

The threat to the UK (England, Wales, Scotland and Northern Ireland) from terrorism is substantial.

Northern Ireland-related threat level

The threat to Northern Ireland from Northern Ireland-related terrorism is severe.

Threat levels

There are 5 levels of threat:

low - an attack is highly unlikely

moderate - an attack is possible but not likely

substantial - an attack is likely

severe - an attack is highly likely

critical - an attack is highly likely in the near future

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

Threat levels do not 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.