Planes could be banned from flying up to 2,500 feet above Windsor Castle amid growing fears for the Royal Family.
The Metropolitan Police applied for a ‘no-fly’ zone over the Queen’s primary residence last year as part of a major security review.
This could result in a prosecution for any unauthorised use of aircraft or drones in the area.
It comes as Jaswant Singh Chail was found armed with a crossbow in the grounds of the historic Berkshire castle on December 25.
The 19-year-old is suspected of trying to get into the residence while the Queen celebrated Christmas. He has since been sectioned under the Mental Health Act.
The incident even prompted a review into the rules around crossbow ownership in England.
A police spokesperson insisted the measure was not brought about in response to any specific threat or intelligence.
Instead, it is intended to ‘further enhance the security at what is an iconic location and keep the community living nearby safe’.
They added: ‘As part of the Met Police’s responsibilities under the Royalty and Specialist Protection Command, the Met is responsible for policing within the footprint of Windsor Castle and we work closely with Thames Valley Police to ensure the Castle and the surrounding areas are kept safe and secure.
‘As part of our ongoing review of security arrangements at Windsor Castle, and working in partnership with Thames Valley Police, we applied for a Restricted Airspace Order for up to 2,500ft at a radius of 1.5 nautical miles around Windsor Castle.’
Kensington Palace is also increasing the protection of the Duke and Duchess of Cambridge after last month’s security breaches.
Another shocking incident saw police shoot dead a suspected gunman near Prince William’s west London residence, where he lives with his wife Kate and their three children George, Charlotte and Louis.
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