The ban aligns with government considerations to proscribe Palestine Action as a terrorist entity, which would effectively outlaw the group.
This decision follows a recent incident where Palestine Action members allegedly infiltrated RAF Brize Norton, damaging aircraft with red paint and crowbars.
Palestine Action announced they would relocate their protest to Trafalgar Square, just outside the police exclusion zone.
Metropolitan Police commissioner Sir Mark Rowley said that Palestine Action members are alleged to have caused millions in criminal damage and assaulted a police officer, providing an operational basis for their potential proscription.