Bravery is currently serving at least 15 years for the shocking crime.
He was arrested on Thursday on suspicion of raping a fellow prisoner – described as in his 30s – in the shower block at HMP Belmarsh.
The 20-year-old was arrested inside the prison and taken to a south London police station.
Scotland Yard confirmed they had been alerted on Thursday, November 11 after an inmate at HMP Belmarsh alleged he had been raped by a fellow prisoner.
A source told the Sunday Mirror: ‘Jonty was quizzed for hours.’
The Met told MailOnline: ‘The incident is alleged to have happened on the morning of Tuesday, 9 November. The alleged victim, aged in his 30s, later informed another inmate and prison authorities were alerted. They then contacted police.
‘The man was seen by specialist medical staff who attended the prison.
‘A man aged in his 20s was arrested on suspicion of rape on Thursday afternoon and was taken to a south London police station.
‘He was later released on bail back into the custody of the prison.’
A Prison Service spokesman said: ‘We are working closely with the police investigation.’
Bravery is currently serving at least 15 years in jail having been convicted of the attempted murder of a six-year-old French boy.
Bravery grabbed the youngster and threw him from a viewing balcony in the gallery onto the ground some 100ft below. The boy suffered life changing injuries but has been slowly improving back in France.
Sentencing Bravery, of Ealing in west London, Old Bailey judge Mrs Justice McGowan said: ‘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.’
She said Bravery’s autism spectrum disorder did not explain the attack, and acknowledged expert evidence 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.’
Well-built Bravery, who was wearing a white T-shirt and dark shorts, sat impassively with his legs crossed and occasionally placed his hands behind his head as he watched the 20-minute hearing via videolink from Broadmoor Hospital.
The court heard Bravery had been in supported accommodation under the care of Hammersmith and Fulham Social Services, with one-to-one supervision, and had a history of lashing out at staff.
Despite this, he was allowed to leave home, unsupervised, for up to four hours at a time.
Prosecutor Deanna Heer said there was evidence Bravery had long harboured his intent to seriously hurt or kill someone, with the teenager’s admissions apparently caught on a ‘shocking, prophetic’ secret recording made by carers. The alarm was not raised with Bravery’s parents.
It was on Sunday August 4 2019 that Bravery left his accommodation and travelled to the Tate Modern in central London, spending at least 15 minutes stalking potential victims before ‘scooping’ a six-year-old boy up and over the railings as the youngster skipped slightly ahead of his family.
CCTV footage not shown in court captured the incident, then showed Bravery backing away from the railings.
The prosecutor said: ‘He can be seen to be smiling, with his arms raised. At one point, he appears to shrug and laugh.’
Ms Heer told the court Bravery then told the boy’s father: ‘Yes I am mad.’
He was also heard to say, with a shrug: ‘It’s not my fault, it’s social services’ fault,’ the lawyer said.
It later emerged that Bravery initially sought to carry out his grim attack at The Shard, Britain’s tallest building, but baulked at the entry fee.
Following his arrest, Bravery was said to have asked police if he was going to be ‘on the news’.
He said he had been ‘seriously unhappy’ recently and that he had to do anything he could to get out of his accommodation.
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