Pro-Palestinian activists from the campaign group Palestine Action entered the UK’s largest air force base, RAF Brize Norton, before dawn on 20 June. Riding electric scooters, they sprayed red paint into the engines of two Airbus Voyager refuelling aircraft and struck the planes with crowbars, causing an estimated £7 million in damage. Police later arrested four suspects, who have been charged with conspiracy to commit criminal damage and to enter a prohibited site. Citing the sabotage and what she called a “long history of unacceptable criminal damage”, Home Secretary Yvette Cooper moved to proscribe Palestine Action under the Terrorism Act 2000. The House of Commons backed the order by 385 votes to 26 on 2 July; peers endorsed it the following day. From 5 July, belonging to, or publicly supporting, the group became a criminal offence carrying penalties of up to 14 years in prison, while displaying its symbols risks a six-month sentence. Palestine Action’s co-founder Huda Ammori sought an urgent High Court injunction to halt the designation, arguing the measure would chill legitimate protest. A judge rejected the request on 4 July, allowing the proscription to take immediate effect. A full judicial-review bid is pending. Since the ban came into force, police have detained more than 100 people at demonstrations across Britain for showing support for the group. The largest single operation occurred on 19 July, when officers arrested 55 protesters in Parliament Square, London, after they held placards reading “I oppose genocide. I support Palestine Action.” Further arrests were reported in Manchester, Bristol, Cardiff and Truro as authorities enforce the new terrorism listing.