London police arrest 139 protesters outside US Embassy over support for banned pro-Palestinian group

London police made 139 arrests during a protest on Saturday outside the US Embassy, in support of Palestine Action, a group banned by the UK government and classified as a terrorist organization. Most of those detained were accused of expressing support for a proscribed organization. Metropolitan Police warned more arrests could occur at the scene.

Protesters included retirees carrying signs stating "I oppose genocide, I support Palestine Action," with one climber atop a tree holding a placard for the group. Defend Our Juries, the activist group organizing the demonstration, reported over 4,000 arrests since July 2025 for protesting the ban. The UK government banned Palestine Action last year under terrorism laws, making support or membership a criminal offense punishable by up to 14 years in prison.

Demonstrations were also held in Edinburgh, Scotland, where no arrests were reported, but Police Scotland stated officers are reviewing evidence involving individuals seen with T-shirts and banners supporting a proscribed group. The Supreme Court hearing for an appeal against the proscribed status of Palestine Action is scheduled for November 4.

Supporters argue the ban is excessive and violates freedom of speech, while the government maintains the decision to outlaw the organization. The United States sanctioned Palestine Action in August, designating it as a terrorist group.