Another arrest has been made in connection with two aircraft being damaged at RAF Brize Norton in Oxfordshire.
A 22-year-old man, of no fixed abode, was arrested on Friday in Bedford on suspicion of the commission, preparation or instigation of acts of terrorism, contrary to Section 41 of the Terrorism Act 2000, Counter Terrorism Policing South said.
Two Voyager planes were damaged at RAF Brize Norton, Oxfordshire, on 20 June.
The arrested man is currently in police custody, police added.
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The Palestine Action group claimed responsibility for causing £7m worth of damage to the aircraft.
Four people were charged last month in connection with the security breach and vandalism.
Amy Gardiner-Gibson, 29, Lewie Chiaramello, 22, Daniel George Jeronymides-Norie, 36, and Jony Cink, 24, are accused of conspiring to damage the aircraft and entering a prohibited area.
They are alleged to have ridden scooters onto RAF Brize Norton and sprayed the planes with red paint on 20 June.
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Palestine Action was proscribed under the Terrorism Act 2000 at the start of last month, after MPs overwhelmingly voted in favour of adding the protest group to the list of banned organisations with the likes of National Action, al Qaeda, ISIS and Hezbollah.
