The Metropolitan Police arrested protesters for offences including supporting the banned terror group Palestine Action. The arrests include six people who were detained for unfurling a banner backing the proscribed group on Westminster Bridge. But the bulk of the arrests occurred in Trafalgar Square, where protesters held placards showing their support for Palestine Action. “The majority of people still remaining in Trafalgar Square are onlookers who are not holding placards in support of Palestine Action. The majority of people still remaining in Trafalgar Square are onlookers who are holding placards in support of Palestine Action.