A 20-year-old UK man has been charged under the Treason Act after allegedly carrying a crossbow onto the grounds of Windsor Castle, where Queen Elizabeth II was staying, on Christmas Day.
The Southhampton man was taken into custody after the security breach on Christmas morning and the Metropolitan Police announced charges on Tuesday (Wednesday morning AEST).
Jaswant Singh Chail, who was 19 at the time but is now 20, was charged with threats to kill and possession of an offensive weapon.
The relevant section of the 1842 treason act under which he is also charged refers to "discharging or aiming fire-arms, or throwing or using any offensive matter or weapon, with intent to injure or alarm her majesty".
The Queen spent Christmas holidays at Windsor, having decided not to stay at Sandringham, the royal estate in eastern England where she traditionally spends the festive season with family.
The Met Police counter terrorism command has been investigating the incident.
"The Crown Prosecution Service reminds all concerned that criminal proceedings against Mr Chail are active and that he has the right to a fair trial," CPS special crime and counter terrorism division head Nick Price told the BBC.
Chail is in custody ahead of an expected appearance at Westminster Magistrates' Court on August 17.
Source: 9News