The Joint Terrorism Analysis Centre raised the United Kingdom national terrorism threat level from substantial to severe on 30 April 2026, the Home Office said in a statement published that evening.
The decision followed a stabbing in Golders Green, north London, on 29 April 2026. The department said the higher rating was not solely a result of that attack.
The shift tells officials, faith institutions, and the public that analysts now judge another terrorist attack to be more probable than before, and it accompanies new money and policing measures aimed especially at protecting Jewish community sites.
In the wording released with the announcement, substantial meant an attack was likely, while severe meant an attack was highly likely in the next six months. The Home Office pointed readers to the Security Service’s public page on terrorism threat levels for fuller definitions of how levels are set and what they imply for everyday vigilance.
Why officials linked the timing to wider risk
The Home Office said the terrorist threat in the United Kingdom had been rising for some time, driven by an increase in the broader Islamist and extreme right-wing terrorist threat from individuals and small groups based in the country.
The statement added that while the national threat level set independently by JTAC reflected the domestic terrorism picture, it came against a backdrop of increased state-linked physical threats encouraging acts of violence, including against the Jewish community.
Money, patrols, and legislation announced the same day
The government said it would invest an additional £25 million to protect Jewish communities after the stabbing and what it called a spate of antisemitic arson attacks in London, bringing total funding in that area to £58 million in 2026 and describing that as the largest investment a government had made to protect Jewish communities on record.
The Home Office said the funding would pay for more police presence and patrols, added protective security at synagogues, schools, and community centres, and an expansion of Project Servator, which deploys specialist and plain-clothes officers trained to spot suspicious activity.
The statement said legislation would be fast-tracked in the coming weeks to clamp down on individuals and groups carrying out hostile activity for foreign states, including those acting as proxies, and that the Home Secretary would receive new proscription-like powers to curb state-backed organisations that posed a national security threat, with stronger tools under the National Security Act for police and intelligence agencies.
What ministers told the public
Home Secretary Shabana Mahmood said in the published statement: "Yesterday’s abhorrent, antisemitic attack was a vile act of terrorism."
She said her thoughts remained with the victims and the whole Jewish community at a time of deep disquiet and fear, and she thanked volunteers and emergency services whose actions saved lives.
Mahmood said the national threat level had increased to severe, which meant a terrorist attack was considered highly likely. She urged people to be vigilant, to report concerns to the police, and she said security services and police were working day and night to keep the country safe.
When the UK last stood at 'severe'
The United Kingdom was last at severe in November 2021 after the Liverpool Women’s Hospital bombing and the murder of Member of Parliament Sir David Amess, the Home Office said, before the level was lowered to substantial in February 2022.
The department described JTAC’s process as independent, systematic, and rigorous, based on the latest intelligence and analysis of internal and external factors that drive the threat.
Further operational detail on investigations into the Golders Green incident was not included in the published national threat-level notice.