A “no-fly zone” could be set up over Windsor Castle while security is being reviewed, the Metropolitan Police said.
An application has been made to arrange the restricted airspace and, if successful, would prevent aircraft from flying up to 2,500 feet above and 1.5 nautical miles around Windsor Castle.
The Metropolitan Police said the order would “further increase security in an iconic location and ensure the safety of the nearby community”.
The force added that the order was requested as part of their ongoing security review and not based on a specific threat or intelligence information.
A 19-year-old man was arrested on Christmas Day for allegedly in possession of a crossbow at Windsor Castle. The Metropolitan Police said it had been divided into sections under the Mental Health Act.
The officers also review a video that appears to show a masked figure in a dark hooded sweatshirt, holding a crossbow, speaking to the camera in a distorted voice, saying they wanted to “murder the Queen” in a “revenge” mission.
The incident prompted Home Secretary Priti Patel to instruct the Home Office to investigate greater control over possession of crossbows.
The Metropolitan Police said it has asked the local community to provide their views on the airspace restriction request.
A spokesman for the force said: “As part of the responsibilities of the Met Police under the Royal and Specialist Protection Command, the Met is responsible for policing within the Windsor Castle footprint and we work closely with Thames Valley Police to protect the castle and the Ensure surrounding areas are safe and secure.
“As part of our ongoing security review at Windsor Castle, and in partnership with Thames Valley Police, we have requested an order for restricted airspace of up to 2,500 feet within a 1.5 nautical mile radius of Windsor Castle.
“This was not done in response to a specific threat or intelligence information, but rather was intended to further increase security at this iconic location and ensure the safety of the community living nearby.”