UK Raises Terrorism Threat Level to Severe

The British government raised the national terrorism threat level to severe on Thursday, signaling that an attack is highly likely within the next six months. The elevation followed a gradual increase in threats from Islamist and extreme right-wing ideologies, with particular risks to Jewish and Israeli individuals and institutions amid the Middle East conflict.

MI5 stated that the change was not solely due to the stabbing of two Jewish men in London's Golders Green area on Wednesday, April 30, 2026, but reflected broader trends.

The US embassy in London issued a security alert on May 2, 2026, advising American citizens in the UK to be cautious, as an attack on the UK is highly likely. The embassy recommended staying alert in public places including schools, hospitals, churches, tourist hotspots, and transport hubs. It also urged varying travel routes and times to reduce predictability and keeping a low profile.

This marks the second security notice from the US embassy in the UK in recent weeks. The previous alert noted recent attacks and threats targeting Jewish and American institutions, advising caution. Last week, the Finchley Reform Synagogue in north London was targeted, and an attack occurred on the Kenton United Synagogue in Harrow.

The Joint Terrorism Analysis Centre, part of MI5, assesses that Islamist terrorism remains the primary threat to the UK, while extreme right-wing terrorism is steadily rising. Severe is the second-highest level on Jtac's five-point scale, meaning a terrorist incident is likely, whereas critical, the highest level, suggests an attack is imminent.

The American warning is based on these threat level assessments by Jtac.

Britain's threat level was last raised to severe in 2021, following the murder of Conservative MP Sir David Amess by an Islamist in Essex and a bomb set off outside Liverpool Women's Hospital by an asylum seeker. It was downgraded to substantial in February 2022. Counter-terror police recently arrested eight people across England over an alleged plot to commit arson attacks.

Metropolitan Police Commissioner Sir Mark Rowley urged Britons to be alert but not alarmed. He expressed concern about the scale of upcoming protests in London and said police are examining conditions and powers for those events. UK police charged a man over the stabbing of two Jewish men in London.

He said to the BBC on the morning of the report: 'If you are on a march or a protest where people are chanting: "globalise the intifada," you do have to stop and ask yourself: "Why am I not calling this out? ' The American Jewish Committee confirms the phrase means aggressive resistance against Israel and those who support Israel.

Pro-Palestine activists claim it means a call for international solidarity, boycott, and peaceful protest against Israel.

The Jewish state has seen two intifadas in its history, both involving violent protest and deadly terrorist attacks. The US embassy issued its security alert on the night before the GB News report and again advised citizens on Friday, May 2, 2026, to remain alert in public places.

The embassy reiterated advice to stay away from schools, churches, tourist locations, and transportation hubs, and for US nationals to vary their travel routes and times to reduce predictability.

MI5 stated on Friday, May 2, 2026, that the Joint Terrorism Analysis Centre raised the threat level from substantial to severe. MI5 noted that the UK has been experiencing a gradual increase in terrorist threats for some time. The increased danger has been driven by a rise in both Islamist and extreme right-wing terrorist threats from individuals and small groups in the UK.

The threat level increase followed an increase in Islamist and extreme right-wing ideology in the UK, according to British counter-terror bosses.