Sir Keir Starmer said he could “guarantee” rioters will “regret taking part in this disorder” in a statement after widespread rioting from far-right mobs in cities such as Rotherham, Leeds, Manchester, and Liverpool over the weekend.
The prime minister’s statement on Sunday came after escalating violence spread across the UK following the deaths of three children in a stabbing attack in Southport on Monday.
Far-right groups have drawn widespread condemnation as the organising force behind disorder in multiple locations in the wake of the killings.
It followed the spread of false claims online that the suspect, identified as 17-year-old Axel Rudakubana from Lancashire, was an asylum seeker who had arrived in the UK by boat.