King Charles III's landmark coronation is only days away, and on Tuesday night there was a security threat at his London home, Buckingham Palace.
A man was detained at the gates of the royal residence after throwing shotgun cartridges over the gates into the palace grounds. He was also said to be in possession of a knife.
So what security measures does Buckingham Palace have?
Surveillance cameras
The 775-room building is carefully kitted out with state-of-the-art CCTV cameras that monitor the grounds 24/7.
Armed guards
Outside of the palace, there is always a physical presence of His Majesty's guards. They are trained to stop any threats to the palace and to the royals.
A no-fly zone
There are strict rules around the airspace above Buckingham Palace, preventing anyone from flying too low to the residence in order to keep it safe.
Security checks
If you're entering Buckingham Palace for any reason, you will be subject to checks of your luggage and person to eliminate any threats.
Secret tunnels and doors
It is believed that the palace is full of secret passageways and these could be very useful if there was a security breach inside the palace as the staff know all of the incognito ways.
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Unclimbable walls
The walls around the palace are equipped with spikes on top to stop people climbing on them and there are also signs which remind the rules – stating that trespassers will be prosecuted.
Panic room
Global Citizen magazine has reported that the palace has a panic room with "bullet-resistant, fire-retardant steel walls”. In the case of an emergency, King Charles, his wife Queen Consort Camilla and any other working royals there at the time would retreat to the safety of the room. It is believed they would have provisions on hand as well as stocks of blood in their respective blood types.
Personal bodyguards
Whenever royals are in residence at the property, they will have their own personal security who travel with them and protect them during their stay. This is on top of the employed security who work directly for the palace.