# UK terrorism threat level — ALERT (stable)
id uk-threat-level · UK Watch · horizon acute · checked 2026-11-01T11:52Z · at this level since 2026-10-31T11:26Z · stale after 2026-11-02T23:52Z
Assessed by an AI model (Anthropic Claude) against published rubrics; not a forecast or advice · CC BY 4.0 · https://canary.danleech.com/s/uk-threat-level

Value: Threat level: Severe
Rated on: Severe or Critical.

UK terrorism threat level raised to Severe: an attack is highly likely

Why it's at this level: The UK national terrorism threat level remains Severe, meaning an attack is highly likely, after MI5 raised it in October 2026. The MI5 Director General warned on 13 Oct of a rising threat from anti-migrant and anti-Muslim extremism alongside Islamist terrorism. No change as of 1 Nov.

What this means for you: Stay alert in crowded places and report anything suspicious via gov.uk/ACT or 999 in an emergency. Follow police and MI5 guidance.

Why it matters: The official MI5 assessment of the likelihood of a terrorist attack in the UK.
What moves it: Intelligence assessment by JTAC.

Rubric — Alert: Severe or Critical. | Watch: Substantial. | Normal: Low or Moderate.

Sources:
- MI5 — UK national terrorism threat level raised to Severe () https://www.mi5.gov.uk/uk-national-terrorism-threat-level-raised-to-severe
- A News — UK faces rising threat from far-right terrorism, warns MI5 chief (2026-10-13) https://www.anews.com.tr/europe/2026/10/13/uk-faces-rising-threat-from-far-right-terrorism-warns-mi5-chief