An autistic British teenager who threw a six-year-old French boy from a 10th-floor viewing platform at the Tate Modern art gallery in London with the intention of killing him was jailed for 15 years on Friday and told he might never be freed.

Jonty Bravery, who was 17 at the time of the incident and told police he carried out the act because he wanted to be on the television news, pleaded guilty to one count of attempted murder last December.

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The unnamed victim, who was visiting Britain with his family, fell 100 feet (30 metres) after he was targeted by Bravery and was found on a fifth-floor roof. His mother was heard by witnesses screaming: "Where's my son? Where's my son?"

London Art Gallery Incident

The boy survived but suffered a bleed to his brain and several fractured bones. Judge Maura McGowan said the boy's life would never be the same again and his parents had been forced to give up their lives to care for him.

"You had intended to kill someone that day. You almost killed that 6-year-old boy," she told Bravery.

Bravery, now 18, who was arrested shortly afterward, told police he had planned to hurt someone at the museum to be on television. He had researched how to kill people on the internet the previous day and before the incident, he had asked a member of the public the location of a tall building.

The teenager, who has autistic spectrum disorder and a personality disorder, was being held at the high-security Broadmoor Hospital but the judge at London's Old Bailey court decided he should be jailed for a minimum of 15 years.

"You may never be released," she said.

In a statement read out by a police officer on their behalf outside court, the victim's parents said he had been able to eat again in January, could speak a little but remain very weak, with many years of physiotherapy ahead of him.

"He is still in a wheelchair today, wears splints on his left arm and both his legs and spends his days in a corset molded to his waist sat in his wheelchair," they said. "He is in pain. There are no words to express what we are going through."