A guest turned streaker outstayed his welcome at the Queen's summer garden party on Tuesday.
It is not known if the Queen saw the streaker at the garden party
Guests cheered as a Beefeater tackled the 17-year-old
man to the floor as he approached the Royal tea tent in the grounds of Buckingham Palace.
Scotland Yard said the youth attended the event with members of his family, and all were invited guests.
He removed his jacket, trousers and shoes, but kept the rest of his clothes on, according to police, who detained but did not arrest the teenager.
Guest Victor Fisk said the man dropped his trousers as he ran across the grass, about 100 yards from the Queen.
"He was running with them around his ankles and then he pulled them up and
kept on running," said flower seller Mr Fisk.
"The Beefeater ran after him and rugby tackled him.
"He swerved past two of them. Someone shouted out 'catch him'.
'Whisked him away'
"He was only a young fellow. One of the chaps he was running past stuck their
foot out and tripped him up. They just whisked him away off quickly."
More than 8,000 people were at the event which was also attended by the Duke of Edinburgh, the Prince of Wales, the Princess Royal and the Earl and
Countess of Wessex.
The incident will spark more concerns about the tightness of security at Royal events.
The pregnant Countess of Wessex was glowing at the party
Last month comedian Aaron Barschak gatecrashed
Prince William's 21st birthday party at Windsor Castle.
On that occasion he was able to bypass security and get so close to William that he planted a kiss on his cheek.
Guests at the garden party were required to show their passports along with their tickets at the entrance.
It is not known if the Queen witnessed the exhibition.
A Buckingham Palace spokesman said: "We understand there has been an incident
but it is a matter for the police."
A Scotland Yard spokeswoman said he had not posed any security risk to the Royal Family.
"He has not been arrested and is being spoken to by police," she said.
"There was no breach of security or risk to the Royal party or other guests."
Liberal Democrat MP Lembit Opik, who was also at the party but missed the
incident, said: "I feel he showed a naked loyalty to the Queen. I applaud