What are terrorism threat levels?

Terrorism threat levels indicate the likelihood of a terrorist attack in the UK. There are two published threat levels.

There are 5 categories at which the threat levels could be set:

Members of the public should always remain alert to the danger of terrorism and report any suspicious activity to the police on 999 or the anti-terrorist hotline: 0800 789 321. If your information does not relate to an imminent threat, you can also contact MI5.

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