Masked burglars have allegedly stolen farm vehicles from the Windsor Castle estate.
Two men scaled a 6ft fence on the night of 13 October and used a stolen truck to break through a security gate, The Sun reported.
The pair then reportedly fled with a pick-up and a quad bike that were stored in a barn.
The King and Queen were not in residence.
But the Prince and Princess of Wales, along with their three children George, 11, Charlotte, nine, and six-year-old Louis were believed to have been in their home, Adelaide Cottage, on the estate, according to The Sun.
The family moved there in 2022.
In a statement to the newspaper, Thames Valley Police said: “At around 11.45pm on Sunday 13 October, we received a report of burglary at a property on Crown Estate land near to the A308 in Windsor.
“Offenders entered a farm building and made off with a black Isuzu pick-up 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.”
Keep up with all the latest news from the UK and around the world by following Sky News
On Christmas Day 2021, a man climbed a fence at Windsor Castle armed with a crossbow and claimed he wanted to kill Queen Elizabeth II.
Jaswant Singh Chail was handed a nine-year custodial sentence for treason, possession of an offensive weapon and making threats to kill.