A 19-year-old man from Southampton has been arrested and he remains in custody at this time.
“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.”