The last time the threat level was considered severe was in February 2022.
Home Secretary Shabana Mahmood said the raising of the threat level “will be a source of concern to many, particularly amongst our Jewish community, who have suffered so much”.
But she insisted the government “will do everything in our power to rid society of the evil of antisemitism”, noting an earlier announcement increasing funding for policing and security around Jewish sites.
“As the threat level rises, I urge everyone to be vigilant, as they go about their daily lives, and report any concerns they have to the police,” Mahmood added.