A man who pushed a 91-year-old passenger onto train tracks in London has been jailed for life.

Key points: Paul Crossley has been sentenced to a hospital order until he is deemed fit for prison

Paul Crossley has been sentenced to a hospital order until he is deemed fit for prison He will be required to serve a minimum of 12 years, the British Transport Police said

He will be required to serve a minimum of 12 years, the British Transport Police said Crossley was last year found guilty of attempted murder for the 2018 attacks

Paul Crossley, 47, underwent months of psychiatric assessment before he was sentenced by a judge to a hospital order until he is deemed fit for prison, where he will spend a minimum of 12 years, the British Transport Police said.

Crossley was last year found guilty of two counts of attempted murder for the 2018 attacks on Sir Robert Malpas, 91, and another man, 23-year-old Tobias French.

Security camera footage showed Crossley attempted to shove Mr French onto the tracks, unsuccessfully, at Tottenham Court Road station in central London on April 27.

He then travelled a couple of stops to Marble Arch station, where he pushed Sir Robert, sending him plunging head-first onto the London Underground line.

CCTV footage shows the moment Paul Crossley pushes Sir Robert Malpas onto the tracks. ( British Transport Police )

The 91-year-old was saved by passer-by Riyad El Hussani, who jumped down from the platform and pulled him off the tracks moments before a train arrived.

Prosecutor Benjamin Aina said Sir Robert, who was knighted by Queen Elizabeth II in 1998, was "in a very bad way" after the attack but had made a good recovery.

"I didn't get much sleep last night," Crossley, who had been diagnosed with paranoid schizophrenia as a teenager, later told police.

The senior investigating officer, Detective Inspector Darren Gough, said it had been a long and traumatic process for the victims.

"The physical and emotional impact of such a determined and unprovoked attack really cannot be underestimated," he said.

Paul Crossley has been sentenced to a hospital order until he is deemed fit for prison. ( British Transport Police )

Reuters