An armed intruder was arrested after breaking into the private grounds of Windsor Castle, reportedly carrying a crossbow, where the Queen was spending Christmas Day.

       The 19-year-old man was arrested by police officers on suspicion of possession of an offensive weapon - as well as breach or trespass of a protected site - at around 8.30am.

       He may have got into the castle grounds using a rope ladder to climb over a fence from an area which is publicly accessible.

       The man, from Southampton, remains in police custody and officers said that they do not believe there is a wider danger to the public.

       Police declined to comment on the nature of the “offensive weapon” but Thames Valley Police Superintendent Rebecca Mears issued a statement confirming that the investigation is ongoing.

       “We are working with colleagues from the Metropolitan Police,” she said. “The man has been arrested on suspicion of breach or trespass of a protected site and possession of an offensive weapon. He remains in custody at this time.

       “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.”