Buckingham Palace has been put on lockdown after a man threw suspected shotgun cartridges on the ground outside the gates.
A man was arrested at the scene, and media crews were evacuated as a controlled explosion was carried out shortly afterwards.
Police cordons remain in place surrounding the area after the man was also found to be in possession of a suspicious bag.
The incident comes just four days before King Charles' Coronation, with rehearsals scheduled to take place for the procession later this evening.
Some roads in the area had already been closed in preparation.
No shots were fired during the incident, and police say there is no ongoing risk to the public.
Metropolitan Police Chief Superintendent Joseph McDonald, said: “Officers worked immediately to detain the man and he has been taken into police custody.
“There have been no reports of any shots fired, or any injuries to officers or members of the public.
“Officers remain at the scene and further enquiries are ongoing.”
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