Buckingham Palace is in lockdown after a man was arrested for throwing what are believed to be shotgun cartridges onto the palace grounds.

A controlled explosion also took place, believed to involve a bag the man was carrying.

Police have said the man was arrested at about 7:00pm local time (4:00am AEST).

Thousands of people were pushed back from the gates as police threw up cordons around the palace.

“A nutty bloke threw some shotgun cartridges through the gates, it’s a minor alarm,” Adam Gilchrist told Ben Fordham.

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