Twenty-five protesters have been arrested outside the United Kingdom’s Supreme Court in London ahead of a hearing over the government’s decision to proscribe pro-Palestinian campaign group Palestine Action under anti-terrorism legislation.
The Metropolitan Police said the demonstrators were arrested on Wednesday on suspicion of showing support for a banned organisation.
The arrests coincided with the start of a Supreme Court appeal by Palestine Action co-founder Huda Ammori, who is seeking to overturn the government’s decision to classify the group as a terrorist organisation.
The hearing, which is scheduled to last two days, from Wednesday to Thursday, will examine whether the government acted lawfully in imposing the ban under the Terrorism Act.
Ammori is challenging the proscription, arguing that the Home Office failed to apply its own criteria when deciding to outlaw the organisation.
Her legal representatives contend that, out of 385 actions attributed to Palestine Action over a five-year period, only three were considered to have met the legal definition of terrorism.
The government is opposing the appeal, maintaining that the group’s activities, including serious property damage, provided sufficient grounds for its proscription.
Palestine Action was banned in July 2025. Under the decision, membership of the organisation or publicly expressing support for it became a criminal offence punishable by up to 14 years in prison.
Founded in 2020, the group says its campaign is aimed at disrupting companies it believes supply weapons or provide other forms of support to Israel.
Its actions have included targeting facilities associated with Israeli defence company Elbit Systems and damaging military aircraft at a Royal Air Force base.
In February 2026, the High Court ruled that the government’s decision to proscribe the group was disproportionate and unlawfully restricted freedom of expression and assembly.
However, the Court of Appeal reversed that ruling in June, finding that the ban was lawful.
Ammori was subsequently granted permission to challenge the decision before the Supreme Court.
The latest arrests come amid a series of demonstrations across the UK opposing the proscription. Police reports said more than 300 people were arrested during a protest outside the United States Embassy in London on Saturday.
The Supreme Court is expected to reserve its judgment after hearing arguments from both sides over the two-day proceedings.
UK police arrest 25 protesters outside Supreme Court over Palestine Action ban