'Troubling' Royal Security Breach: Prince William and Kate Middleton 'Were at Home' When Unidentified Burglars Broke Into Their Windsor Castle Estate

Prince William and Catherine, Princess of Wales' Windsor Castle Estate home was broken into in October, and the unidentified intruders remain at large.

Even worse, the future king and queen were reportedly in residence as the burglars rummaged through their belongings.

"At around 11:45 p.m. on Sunday 13 October, we received a report of a burglary at a property on Crown Estate land near to the A308 in Windsor," the Thames Valley police shared. "Offenders entered a farm building and made off with a black Isuzu pickup and a red quad bike. They then made off towards the Old Windsor/Datchet area. No arrests have been made at this stage and an investigation is ongoing."

"For Prince William and Catherine, this is of course horrific because at this time, when they are under immense stress due to her health concerns, this is the last thing they need," royal expert Hilary Fordwich told Fox News.

"Who on Earth could sleep well at night knowing this sort of violation of their safety has taken place?... Supposedly, armed guards have been [previously] removed because they were viewed as unpleasant for the tourists and the public to see. Surely, tourists would be calm and happy to see the royal family protected by armed guards!" she added.

The break-in comes at a time when the Prince and Princess of Wales are focusing on "peace and calm" in both their private and public lives due to the future queen's chemotherapy recovery.

"William and Catherine… were in no danger whatsoever," royal expert Neil Sean told the outlet. "But a source pointed out to me the situation could’ve had a far more sinister turn… the fact that [the burglars] got so far inside Windsor grounds was very alarming, particularly for William. Naturally, [he] is worried about any stress and concern about his wife, and of course, his father."

Royal commentator Kinsey Schofield also weighed in on the alarming security breach. "It is quite scary for the people that live within the Windsor Castle grounds," she told the publication. "It is a bit of a sanctuary despite the foot traffic. I have been shuffled out at closing time, so the occupants of the grounds can enjoy some level of normality in the day."

The host of the "To Di For Daily" podcast further observed, "A few years ago, someone also attempted to ambush Queen Elizabeth II there," she pointed out. "Knowing how expensive royal security costs are, it’s disappointing to discover how ineffective they have been. And while ugly… it sounds like it’s time to invest in some modern technology."

The Prince and Princess of Wales have not commented on the incident nor has their official base, Kensington Palace.