Three people have been arrested on suspicion of a terror offence, after two planes at an RAF base were vandalised in an action claimed by soon-to-be banned campaign group Palestine Action. Counter Terrorism Policing South East (CTPSE) said a woman, aged 29, and two men, aged 36 and 24, have been taken into police custody after the incident at RAF Brize Norton on June 20. They are accused of the commission, preparation or instigation of acts of terrorism, contrary to Section 41 of the Terrorism Act 2000. A 41-year-old woman was also arrested on suspicion of assisting an offender, they said. Palestine Action previously posted footage online showing people inside the Oxfordshire base, with one person appearing to ride an electric scooter up to an Airbus Voyager air-to-air refuelling tanker, before spray painting into its jet engine. CTPSE said the four arrests were made in London and the Newbury area of Berkshire on Thursday. The Home Secretary made the decision to proscribe Palestine Action following the incident, with the arrests coming just days before the proscription is set to come into force. Support for the group will become a criminal offence punishable by up to 14 years in prison when the ban comes into effect as soon as next Friday. Palestine Action has staged demonstration that have included spraying the London offices of Allianz Insurance with red paint and vandalising US President Donald Trump’s Turnberry golf course in South Ayrshire. As she announced plans for Palestine Action’s proscription, Yvette Cooper said the group’s methods have become “more aggressive”, with its members showing “willingness to use violence”.