A teen who threw a boy 100ft from a viewing platform last year has been jailed for a minimum of 15 years it has been reported today.

The incident took place at the Tate Modern viewing platform in London, and prior to the assault, autistic teenager Jonty Bravery, 18, reportedly spent more than 15 minutes stalking potential victims.

Watch a full news report on the sentencing below:

[[youtubewidget||https://www.youtube.com/watch?v=exNJbvqYD-E]]

Bravery carried out the unprovoked attack when the six-year-old victim, whose name can't be disclosed because of his age, briefly left his parents' side.

The judge warned Bravery that there is a chance that he will never be released from jail, and the victim's family released a statement cited by Sky News that stated he has "many years of physiotherapy ahead of him".

"We have no prospects or plan for the future, other than being by his side," they said.

Bravery who carried out the attack in August of last year when he was 17 "scooped [the victim] up and, without any hesitation, carried him straight to the railings and threw him over".

The boy fell onto the platform below and Bravery was immediately challenged by witnesses including the victim's parents.

The 18-year-old who is from Ealing, West London, admitted to attempted murder.

Jonty Bravery. [[imagecaption|| Credit: PA Images]]

After the incident, he reportedly had a "big smile on his face" and told the victim's father "Yes, I am mad."

Old Bailey judge Justice McGowan said while sentencing Bravery: "The fear he [the victim] must have experienced and the horror his parents felt are beyond imagination.

"You had intended to kill someone that day - you almost killed that six-year-old boy."

Judge McGowan said Bravery's attack could not be explained by his autism spectrum disorder (ASD) and cited expert evidence that concluded he presents "a grave and immediate risk to the public".

The judge added: "You will spend the greater part - if not all - of your life detained... you may never be released."

Teen who threw boy 100ft from viewing platform jailed for minimum 15 years