Twelve people have been arrested across England after counter-terrorism police uncovered what they describe as an extreme right wing terrorism plot targeting one of Britain’s largest Muslim gatherings. Three of those detained face suspicion of conspiracy to murder. But the arrests are not an isolated data point. They land squarely inside a trend UK security services have been documenting for years, a steady rise in far right terrorism that recently pushed the national threat level to its highest point in over four years.
What Happened at Shrubland Hall
The UK Ijtima, an annual Islamic gathering organised by a Sunni Muslim missionary group, brought an estimated 15,000 people to Shrubland Hall in Suffolk for four days of worship, study and reflection. Counter Terrorism Policing London said it became aware of a potential serious threat toward the event and moved quickly, making arrests in Ipswich, Greater Manchester, Essex, Surrey and London. Those detained range in age from 27 to 82. Eight were arrested under terrorism laws, three on suspicion of conspiracy to murder, and a 48 year old woman on suspicion of assisting an offender. Suffolk Police declared a major incident, coordinated a safe departure for all 15,000 attendees, and the event closed several hours earlier than planned as a precaution. Commander Helen Flanagan, head of Counter Terrorism Policing London, said officers moved extremely quickly once the threat became known, acknowledging the news would be concerning to the public and particularly to Muslim communities, given the intended target.
A Pattern, Not an Isolated Incident
What makes this arrest significant beyond the immediate threat is where it sits inside a broader trajectory. In May 2026, the Joint Terrorism Analysis Centre raised the UK’s national terrorism threat level from Substantial to Severe, meaning an attack is now assessed as highly likely, the first time the level has reached that tier in over four years. MI5 has been explicit that this change reflects a sustained rise in both Islamist and extreme right wing terrorism, not a single triggering event. According to Counter Terrorism Policing’s own published figures, roughly 30 percent of everyone currently imprisoned in Britain for terrorism offences are extreme right wing terrorists, white supremacists and neo Nazis, while Islamist extremism still accounts for the larger overall share of investigations. MI5 Director General Ken McCallum has also flagged a troubling generational shift, 13 percent of everyone currently under MI5 investigation for terrorism involvement is under 18, a threefold increase in just three years, with extreme right wing radicalisation skewing especially young and driven heavily by online propaganda.
The Muslim Council of Britain’s Response
Responding to the arrests, a spokesperson for the Muslim Council of Britain said the incident cannot be treated in isolation, pointing to racist violence in Belfast and a terror related attack in Edinburgh that injured five men, both within the past month, as part of the same pattern. The organisation called on ministers to match statements of condemnation with concrete policy action.
How the Threat Has Evolved
MI5 has described the extreme right wing terrorism landscape as shifting away from structured, organised groups toward a more diffuse threat, loose networks of self radicalised individuals, often connected only online, motivated by overlapping ideologies including white nationalism and conspiracy theories. Much of this activity now involves individuals deciding independently to act rather than being directed by an organised group, making these plots harder to detect in advance. Home Office data covering the year to September 2025 recorded 256 terrorism related arrests outside a separate proscription case, a 3 percent rise on the previous year, consistent with the overall upward trend security officials have been tracking.
What This Means Going Forward
The Shrubland Hall plot did not happen in a vacuum. It reflects a documented, years long rise in far right terrorism that UK intelligence services have repeatedly warned about, now reflected directly in the country’s threat level, prison population data and the age of those being radicalised. For Muslim communities in Britain, the concern raised by police themselves is not about a single thwarted plot, but about what that plot represents within a threat picture that continues to grow.
Sources:
· Total of 12 arrests as part of Counter Terrorism Policing (CTP) London investigation — Metropolitan Police: https://news.met.police.uk/news/total-of-12-arrests-as-part-of-counter-terrorism-policing-ctp-london-investigation-511324
· Twelve arrested over alleged far-right terror plot targeting major Muslim gathering in Suffolk — 5Pillars: https://5pillarsuk.com/2026/07/13/twelve-arrested-over-alleged-far-right-terror-plot-targeting-major-muslim-gathering-in-suffolk/
· Counter-Terror Police Foil Alleged Far-Right Plot as 12 Are Arrested Across Britain — IBTimes UK: https://www.ibtimes.co.uk/counter-terror-police-foil-far-right-plot-uk-islamic-gathering-1808444
· UK National Terrorism Threat Level Raised To Severe — MI5: https://www.mi5.gov.uk/uk-national-terrorism-threat-level-raised-to-severe
