On Saturday, four activists were detained after a brazen protest at the Tower of London, where they defaced the display case of the celebrated Imperial State Crown.

The group, Take Back Power, used apple crumble and yellow custard to draw attention to their demand for a permanent citizens' assembly and heightened taxes on the wealthy.

The protest caused the closure of the Crown Jewels display, adding to the list of acts aimed at treasured artifacts for political reasons.

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