Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings. Since 2016, the number of children aged under 18 found to have committed murder or manslaughter has risen by 77 per cent, according to the responses.The number of young offenders who committed rape or sexual assault using a knife rose by 38 per cent and the number of teenagers linked to robbery offences with a knife rose by over 50 per cent.Two-thirds of knife-related injuries treated in hospitals were outside London, a figure which will come as little surprise to many living in cities such as Manchester and Birmingham that have witnessed an explosion of violence.David Jamieson, the West Midlands Police and Crime Commissioner, last week described the spate of stabbings in Birmingham and the capital as a “national emergency” after three teenagers died in Birmingham knife attacks in a fortnight. Despite the fact that 2018 was the capital’s bloodiest year for a decade, Birmingham’s murder rate per capita was even higher during the six months between April and September.Nick Hurd MP, the Minister for Policing, told Monday night’s Dispatches: “This is a massive challenge for our policing system and therefore a big priority for me as policing minister to make sure that our police system has the resources to invest in upgrading our technology.“One of the big challenges underpinning is the reality that for too many young people, particularly in our big cities, carrying a knife now feels normal.”He said that this year, £460 million more of public money was being ploughed into the police system, funding the recruitment of at least another 2,500 police officers.Mr Hogan-Howe has called for a knife-crime tsar to help tackle the epidemic. It comes after two 17-year-olds, Jodie Chesney and Yousef Makki were stabbed to death in separate incidents in London and Manchester. Britain’s second city has seen 97 stabbings since the start of this year. The number of children admitted to hospital with stab wounds has soared by 93 per cent in five years, according to new research.As two more families suffer the unimaginable consequences of an escalating crisis, an investigation found that the number of children being convicted of knife crime offences was rapidly rising.Knife crime was also found to be twice as high outside London, according to analysis by Channel 4’s Dispatches, chiming with warnings of a “national emergency”.It came as a man in his 30s was arrested in connection with two stabbings in central London on Sunday and Scottish actor Tam Dean Burn revealed he was recovering at home after being stabbed in an Edinburgh street after speaking at an event. A 42-year-old man was arrested in connection with the incident.Bernard Hogan-Howe, the former Metropolitan Police Commissioner who fronted the latest investigation, warned that more resources needed to be ploughed into less affluent areas and attention focused on the exploitation of children used by adult drug dealers. Yousef Makki was killed in ManchesterCredit:Family Handout “We need to increase police numbers in these areas and reduce the drug supply into the UK and its distribution including by county lines,” he said.“Something law enforcement and government have failed to do.” Hazrat Umar, 18, who was killed in BirminghamCredit:FAMILY HANDOUT New analysis of NHS data revealed a 93 per cent rise in the number of children aged 16 and under being treated for assault by a knife or other sharp objects in the last five years, increasing from 180 in 2012/13 to 347 in 2017/18.Freedom of Information requests sent to police forces across England and Wales also provided fresh insight into the rises in numbers of children involved in knife crime.