Police are searching for suspects who broke into the primary residence of Prince William, Catherine, Princess of Wales, and their family.

Thieves broke into the grounds of Windsor Castle, King Charles' residence west of London, and stole two vehicles from royal land, police said, in a major breach of security.

Burglars broke into the grounds of Britain's royal Windsor Castle in October and stole two vehicles from a barn, Thames Valley Police said.

King Charles and his wife Camilla were not in the estate at the time of the incident but Prince William and his family were believed to be at Adelaide Cottage, part of the Windsor Castle estate, the Sun reported.

British police are investigating a burglary on the Windsor Castle estate, fueling concerns about security at the royal residence west of London