Police have foiled a terror plot on the King's guards after a 'lone actor' caused a 'huge security scare'.

The 20-year-old was arrested on suspicion of possessing an offensive weapon and arson in Slough last week at the Salt Hill Activity Centre, near Windsor Castle.

It comes as military personnel at a barracks close by were warned not to leave the grounds in uniform, with the alert remaining in place for two days.

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