A reported record number of people are held in Britain over terrorism-related offences, according to coverage in the Daily Mail. The figure cited is 273 individuals in custody. The article says the group includes people linked to both Islamic extremist and right-wing extremist ideologies, with “almost all” of those held falling into one of those categories. It also highlights Hashem Abedi, who is described as the brother of Salman Abedi, the Manchester Arena suicide bomber, as one of the people detained.

The reporting presents the count as an increase to a record level, but it does not provide additional context in the supplied excerpts, such as the timeframe used to define “currently,” how the figure compares to previous years, or whether any of the detainees are convicted versus being held pending trial. The sources provided are limited to this single outlet, so other perspectives or official data checks are not included in the available material.