Jaswant Singh Chail, 19, who was allegedly armed with a crossbow, was arrested in the castle’s grounds on Christmas Day. The Queen, Prince Charles and Camilla and Prince Edward and Sophie were thought to be inside.
In a chilling video sent 24 minutes earlier, a masked figure told how he planned to assassinate the Queen, 95, in revenge for the 1919 Amritsar Massacre in India.
Chail was later sectioned under the Mental Health Act.
The intruder did not get into any buildings and was seized by armed police shortly after CCTV caught him clambering over a wrought iron fence at 8.30am, said Scotland Yard.
Police have not named him but later Chail’s father, Jasbir Singh Chail, said: “Something’s gone horribly wrong with our son and we are trying to figure out what. We’ve not had a chance to speak to him but are trying to get him the help he needs.
“From our perspective, we are going through a difficult time. We are trying to resolve this issue and it’s not easy.”
The Snapchat video shows a menacing figure in a black hoodie and white mask holding a crossbow.
Speaking in a distorted voice, the figure says: “I’m sorry. I’m sorry for what I’ve done and what I will do.
“I will attempt to assassinate Elizabeth, Queen of the royal family.
“This is revenge for those who have died in the 1919 Jallianwala Bagh massacre.”
Also known as the Amritsar Massacre, up to 1,500 people were killed when British troops opened fire on protesters in the Punjab, India, in April 1919. Around 1,200 more were wounded.
The figure adds: “It is also revenge for those who have been humiliated and discriminated on because of their race. I’m an Indian Sikh, a Sith. My name was Jaswant Singh Chail. My name is Darth Jones.”
There are three Star Wars references. The Sith are the foes of Jedi Knights and worship the dark side of the “Force”. “Darth Jones” may refer to the actor James Earl Jones, who was the voice of Darth Vader in the early Star Wars movies.
Behind the masked figure there is a picture of Star Wars bad guy Darth Malgus on the wall. A message sent with the video suggests the writer expected to die – presumably shot dead by police.
It reads: “If you have received this then my death is near. Please share this with whoever and if possible get it to the news if they’re interested.”
It was posted at 8.06am. Soon after, counter-terrorism police went to the Chail family home, a four-bed detached house on a private estate in North Baddesley, Southampton. Chail lives there with his parents and teenage sister. His father runs an IT software firm.
Scotland Yard said: “Security processes were triggered within moments of the man entering the grounds and he did not enter any buildings.”
‘If you have received this then my death is near…if possible get it to the news’