
Penge south-east London, on 2 November (Metropolitan Police)
Ms Dick said the crime wave was being driven by a "core group of young offenders" repeatedly committing assault and robbery "with relative impunity".
The Commissioner cited the case of a 16-year-old boy from south London who has committed 42 separate crimes including assault and drugs offences in three years, carries a knife, is involved in gangs, but has never been jailed.
"Ms Dick said
" He's a child - he's our responsibility and we have to ask ourselves what is it about the system that is not working? "
"Why is he offending so much and how is he able to? And he is by no means alone. "
She argued that an increasing number of young people do not fear state action and are not deterred by the threat of imprisonment because they do not believe theywill be jailed, or that it would be for a short time.
Ms Dick has been invited as a guest speaker by the Howard League for Penal Reform, which campaigns for poor people and failures within the criminal justice system.
Frances Crook, the charity's chief executive, said the Commissioner had "used the opportunity to call for more young children, in effect more black boys, to be sent to prison and for longer".
In a damning response, she said Ms Dick "did not deliver a lecture - it appeared to be a few unconnected thoughts presented as challenges to the audience".
Ms Crook added: "It's rather surprising that the head of the Met is not that of something else? good stories to tell about the work of her organization. "
While Ms Dick argued that prison protects the public from dangerous people, he admitted that two out of three teenagers go on to reoffend within a year of their release.
"We also know that many of the perpetrators of violent crime are victims of violent crime and vice versa," she added.
One in three robbery victims is aged 10 to 19, while the 26 per cent of rape victims are in the same age group, along with 16 per cent of sexual offenders.
"We need to step in the earlier into people's lives," the Commissioner said. "We need to give more real deterrents and we need to use the opportunity that imprisonment could give to better ensure that children, and we must remember they are children, do not reoffend."
A HM Inspectorate of Prisons report found that not one youth jail in England and Wales is currently safe after a "staggering rise" in violence, easy access to drugs and declining emphasis on rehabilitation
A separate report by Labor MP David Lammy also found that black people in the UK are proportionally more likely to be imprisoned than those in the US.
Andrew Neilson, director of campaigns at the Howard League, said that it should not be locking young offenders up "for the remainsder of their childhoods in institutions that have been deemed unsafe".
"There is no evidence that more prison sentences will actually work," he told The Independent.
"Knife crime was falling when mandatory sentences for knife possession were introduced a few years ago, and now it's rising.