UK Chief Rabbi Decries Targeted Violence Against Jews as Police Probe Islamic Group in Arson Attacks

In less than a month, four arson or attempted arson attacks have struck Jewish sites across northwest London. Charity ambulances torched in a synagogue car park. A petrol bomb hurled through a synagogue window. An accelerant bottle thrown inside another. A man caught trying to ignite fluid-filled containers outside a Jewish charity. Each incident has deepened alarm among Britain's roughly 290,000 Jews — and drawn UK counterterrorism police into an investigation that now stretches across European borders, into the murky realm of state-sponsored hybrid warfare.

The Attacks: A Timeline of Escalation

The campaign — if it is one — began on the night of March 23, 2026, when several ambulances belonging to Hatzola, a Jewish volunteer rescue service, were set ablaze in the car park of a synagogue in Golders Green, the heart of London's largest Jewish community [1]. Three people have been charged in connection with that attack, and six people in total were arrested, including two 18-year-olds [2].

The pace quickened in April. On April 16, an attack targeted the offices of Iran International, the Persian-language news channel critical of Tehran's government [3]. The same week, on a Wednesday night, a bottle containing accelerant was thrown inside Finchley Reform Synagogue in north London. Police arrested a 46-year-old man and a 47-year-old woman in Watford on suspicion of "arson endangering life" [4]. On Friday, April 18, a man attempted to ignite a bag containing three bottles of fluid outside the former premises of Jewish Futures, a charity in Hendon [3]. Then overnight on April 18-19, a petrol bomb was thrown through a window of Kenton United Synagogue in Harrow, causing smoke damage to a medical room but no injuries [5].

Metropolitan Police Deputy Commissioner Matt Jukes stated plainly: "We are seeing a concerted campaign against Londoners and, specifically, against British Jews" [2]. The force has flooded northwest London with additional uniformed and plainclothes officers, and counterterrorism officers are now leading the investigation [3].

In total, police have made over 15 arrests in relation to six incidents targeting Jewish premises, the Hatzola ambulance service, and a Persian-language media organisation [3]. No one has been injured in any of the attacks.

The Chief Rabbi Speaks

Chief Rabbi Ephraim Mirvis, the spiritual leader of the United Hebrew Congregations of the Commonwealth, issued a statement characterising the violence as "a sustained campaign of violence and intimidation against the Jewish community of the UK" that is "gathering momentum" [1]. His language was deliberate: by framing isolated incidents as a coordinated campaign, Mirvis sought to convey that Britain's Jewish community perceives a pattern, not a series of coincidences.

Prime Minister Keir Starmer echoed the severity: "This is abhorrent and it will not be tolerated. Attacks on our Jewish community are attacks on Britain" [3]. Home Secretary Yvette Cooper described the events as "deeply shocking" [5].

Who — or What — Is HAYI?

Each attack has been claimed online by a group calling itself Harakat Ashab al-Yamin al-Islamia (HAYI), which translates roughly to "The Islamic Movement of the Companions of the Righteous." The group emerged on March 9, 2026 — days after U.S. and Israeli military strikes against Iran — when it claimed responsibility for a makeshift bomb that blew out windows at a synagogue in Liège, Belgium [6]. It subsequently claimed attacks on a synagogue in Rotterdam and a Jewish school in Amsterdam [7].

But HAYI may be less than it appears. An analysis by the International Centre for Counter-Terrorism (ICCT) in The Hague identified multiple red flags [7]:

• No prior existence: No online or offline trace of HAYI existed before March 9, 2026.
• Linguistic errors: The group's Arabic-language logo misspells the word "Islamic" (al-Islamia instead of the grammatically correct al-Islami), and its imagery features a Soviet SVD Dragunov sniper rifle rather than the AK-47 motifs standard among Iran-backed militias.
• Fabricated claims: Geolocation analysis confirmed that one video purporting to show an attack in Greece actually depicted the Rotterdam explosion. Greek authorities reported no such incident.
• Suspicious dissemination pattern: HAYI's claims were distributed through four Arabic-language Telegram channels with hundreds of thousands of followers, at least two of which are linked to Iraqi pro-Iranian Shia militias including Asaib Ahl al-Haq, which maintains close ties to Iran's Quds Force [7].
• Near-instantaneous reporting: The Rotterdam synagogue attack at 3:40 a.m. was reported by these channels at 3:57 a.m. with video claims by 4:19 a.m. — suggesting perpetrators or intermediaries informed the channels in near-real-time [7].

The ICCT assessment concluded that HAYI is likely "a façade for Iranian hybrid operations that enable plausible deniability" rather than an authentic militant organisation [7]. Tech Against Terrorism separately described the group as "astroturfed" — manufactured to appear grassroots [6].

Deputy Assistant Commissioner Vicki Evans acknowledged the ambiguity: "We are aware of public reporting that suggests this group may have links to Iran. As you would expect, we will continue to explore that question as our investigation evolves" [3]. She also referenced Iran's "routine use of criminal proxies" and raised the possibility that the attacks involve "recruiting violence as a service" — paying individuals with no ideological commitment to carry out attacks for cash [3].

The Iranian Shadow War in Europe

If HAYI is indeed an Iranian front, the London attacks fit a broader and well-documented pattern. The ICCT report noted that Iran has conducted 102 documented external operations in Europe since 1979, with more than half occurring since 2021 [7]. MI5 disrupted more than 20 Iranian-linked plots in the UK during 2025 alone [7].

Recent precedents include arrests in Germany of individuals "acting on behalf of the Quds Force" who were planning attacks on Israeli and Jewish locations, a 2024 assassination attempt against an Iranian dissident in Haarlem in the Netherlands assessed as "likely" Iranian-directed, and the killings of Dutch nationals of Iranian origin in 2015 and 2017 with "strong indications" of Iranian involvement [7].

The operational profile of the London attacks — nighttime strikes designed to cause property damage but avoid casualties, using unsophisticated incendiary devices, carried out by young locally recruited individuals — is consistent with what analysts describe as Iran's "outsourced, deniable sabotage" model [2][7]. The arrested suspects in related European attacks include teenagers recruited via social media, a pattern also observed in Russian hybrid operations [7].

However, the evidence remains circumstantial. Some security experts urge caution, noting that HAYI's claims could be opportunistic — a group or individuals taking credit for attacks they did not organise [6]. The operational errors and unsophisticated methods could argue against professional state direction, even as the dissemination infrastructure points toward it [7].

Why Not Proscription?

A question raised by several commentators: if UK authorities suspect an organised campaign, why has HAYI not been proscribed — formally banned — under the Terrorism Act 2000?

The legal threshold is specific. The Home Secretary may proscribe an organisation only if satisfied it is "concerned in terrorism," which the Act defines through three limbs: the action must involve serious violence or property damage; it must be designed to influence a government or intimidate the public; and it must advance a political, religious, racial, or ideological cause [8]. Proscription requires parliamentary ratification.

The difficulty with HAYI is existential: it may not be an "organisation" in any meaningful sense. If it is a branding exercise layered over state-directed freelancers, there may be no entity to proscribe. Counter-terrorism policing in the UK has noted the challenge of groups that "deliberately operate below counterterrorism thresholds" while still causing harm [8]. The distinction between a hate-crime network and a terrorist organisation depends less on ideology than on whether the statutory test is met — a bar that, in practice, has been applied to both Islamist and far-right groups. Since 2001, the UK has proscribed over 80 organisations, including far-right groups such as National Action, banned in 2016 for glorifying the murder of MP Jo Cox [8].

The Numbers: Antisemitism in Britain by the Data

The Community Security Trust (CST), the charity that monitors and responds to antisemitism in the UK, recorded 3,700 antisemitic incidents in 2025 — the second-highest annual total on record and a 4% increase over 2024's 3,556 incidents [9]. The all-time peak remains 2023, when 4,298 incidents were logged in the aftermath of the October 7 Hamas attack on Israel [9].

Source: Community Security Trust

Data as of Feb 11, 2026CSV

The data reveals a structural shift. Before October 2023, the CST had only five times recorded a single month with more than 200 incidents. In 2025, every single month exceeded that threshold, with a monthly average of 308 — exactly double the pre-October 2023 average of 154 [9].

The breakdown by category shows 3,086 cases of abusive behaviour (83% of the total), 217 cases of damage and desecration (a 38% increase from 2024 and a record high), 196 direct threats, 170 assaults, and four instances of extreme violence, including the fatal attack at Heaton Park Synagogue [9]. Online incidents accounted for 1,541 cases, or 42% of the total — a 23% increase from 2024 [9].

Greater London and Greater Manchester together accounted for 61% of all incidents nationally [9].

For comparison, Germany recorded over 8,627 antisemitic incidents in 2024, while France logged approximately 1,600 [10]. Across Europe, a 2024 EU Fundamental Rights Agency survey found that 96% of Jewish respondents had encountered antisemitism [10].

The Security Burden: Who Pays?

The financial cost of protecting Jewish community life in Britain is substantial and distributed unevenly across government and community budgets.

The UK government's Jewish Community Protective Security Grant provides up to £28.4 million for 2026-27, funding security guards, CCTV, fencing, intruder alarms, and floodlights at synagogues, schools, and community centres. The grant is administered by the CST [11]. This represents a significant increase from the £14 million baseline before October 2023, when an emergency £3 million top-up was provided, and then former Prime Minister Rishi Sunak pledged more than £70 million over four years [12].

Source: UK Government

Data as of Apr 1, 2026CSV

For comparison, the Protective Security for Mosques Scheme received up to £40 million for 2026-27, while Christian, Hindu, Sikh, and other faith sites share a combined £5 million through the Places of Worship Protective Security Scheme [11]. The disparity in per-site funding reflects differing threat assessments: the Jewish community, numbering roughly 290,000, receives approximately £98 per capita in security funding, while the Muslim community of roughly 4 million receives approximately £10 per capita — though the mosque scheme covers a far larger number of sites.

Beyond government grants, individual institutions carry their own costs. The United Synagogue, representing some 60 communities, has reported spending approximately £1 million annually on private security measures [12]. Smaller synagogues and community organisations have had to hire additional private security firms and expand volunteer patrol networks. The CST itself operates a nationwide volunteer security network, training thousands of community members to provide on-site security at Jewish events, schools, and synagogues [12].

European Parallels and Policy Responses

The targeting of Jewish institutions by actors with suspected Islamist or state connections is not unique to Britain. Belgium and the Netherlands have faced similar attacks claimed by HAYI in March 2026 [6][7]. The ICCT analysis noted that these countries present particular vulnerability due to established organised crime networks experienced with explosives — the Netherlands alone recorded over 1,500 improvised explosive device incidents in 2025 — and a growing phenomenon of young criminals recruited via Telegram and TikTok for tasks ranging from intimidation to targeted killings [7].

Germany's experience is instructive. In 2024, two of eight incidents classified as "extreme violence" were Islamist terrorist attacks: the August 2024 Solingen attack, where an ISIS supporter killed three people, and a September 2024 assault on the Israeli Consulate in Munich [10]. German security services have responded with a multi-vector approach, tracking antisemitism from far-right, far-left, Islamist, and protest-linked sources simultaneously.

France, which has Europe's largest Jewish population, has maintained a permanent military deployment — Opération Sentinelle — at Jewish sites since the 2015 Hyper Cacher attack. The EU's 2024 progress report on combating antisemitism called for member states to adopt national strategies, improve data collection, and designate antisemitism coordinators [10].

Campaign or Coincidence?

The Chief Rabbi's characterisation of a "sustained campaign" finds support in the data. The CST's record of 217 damage and desecration incidents in 2025 — before the 2026 arson spree even began — represents a 38% year-on-year increase [9]. Metropolitan Police leadership has used the word "campaign" as well [2].

The counter-argument — that these incidents are the work of unconnected individuals opportunistically exploiting a volatile climate — cannot be dismissed. The arrested suspects range from teenagers to middle-aged couples, with no obvious organisational link [4][5]. If HAYI is indeed a hollow brand, individuals may be acting independently while the group retroactively claims their actions.

But the ICCT's analysis of the dissemination infrastructure — the near-instantaneous Telegram reporting, the channels linked to Iranian-backed Iraqi militias, the pattern of nighttime property attacks designed to terrorise without killing — points toward at least a degree of coordination, even if the operatives themselves are loosely connected freelancers rather than members of a hierarchical organisation [7].

The distinction matters for policy. If these are hate crimes by unconnected actors, the response is primarily one of policing and community protection. If they constitute a state-sponsored hybrid warfare campaign, the response must also be diplomatic and intelligence-driven. UK authorities appear to be treating the attacks as both simultaneously — a pragmatic approach, but one that leaves the fundamental question of attribution unresolved.

What Comes Next

As of April 20, 2026, counterterrorism police continue to investigate the attacks and their potential links to Iran. Over 15 arrests have been made, but no one has yet been charged under terrorism legislation — all charges so far relate to arson offences [2][4]. The conviction rate for religiously aggravated offences in the UK has historically hovered around 83-85%, though specific data on religiously aggravated arson is not publicly disaggregated [13].

The UK government has accused Iran of using criminal proxies to conduct attacks on European soil targeting both opposition media outlets and Jewish communities [3]. Whether that accusation will translate into formal diplomatic consequences, intelligence disclosures, or proscription of any entities remains to be seen.

For Britain's Jewish community, the immediate reality is one of heightened vigilance, increased security costs, and the knowledge that their synagogues, ambulances, and charities have become targets. The data — 3,700 antisemitic incidents in 2025, record-high property damage, and now a spring 2026 arson spree — describes a community under pressure that shows no sign of easing.