Police said they arrested an armed intruder on Saturday on the grounds of Windsor Castle in England, where Queen Elizabeth II is spending Christmas with her family after canceling her annual retreat at Sandringham Estate.

Rebecca Mears, the superintendent of Thames police, said the suspect is in custody on suspicion of breach or trespassing on a protected site and possession of an "offensive weapon."

"An investigation is ongoing following this incident and we are working with colleagues from the Metropolitan police," Mears said, according to Sky News. "We can confirm security processes were triggered within moments of the man entering the grounds and he did not enter any buildings. Members of the Royal Family have been informed about the incident. We do not believe there is a wider danger to the public."

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The suspect is a 19-year-old man from Southampton, England, Mears said.

The queen's sons, Prince Charles and Prince Edward, and their wives were also in the castle to spend Christmas with the queen. Other members of the royal family were also present at the castle. Prince William is spending Christmas at the Sandringham Estate with Kate, the Duchess of Cambridge, and members of the Middleton family.

The royal family at Windsor attended a Christmas service at St. George's Chapel without the queen, who chose to stay back at the castle as a precaution, according to Sky News.

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The trespassing on the castle grounds comes a week after a woman banged on the door of Prince Andrew's car and yelled as he drove through Windsor.