The focus is on 10 - 21 year olds, and detached policing methods.
A spike in violent crime in London saw more murders committed in the city in February and March than there were in New York, figures show.
So far in 2018, the Met Police has investigated 46 murders, compared with 50 in the US city.
But, while New York's murder rate decreased from the end of January, London's rose markedly from that point.
Ex-Met Police Ch Supt Leroy Logan says it is proof that "London's violent traits have become a virus".
Statistics from the New York Police Department (NYPD) and the Metropolitan Police, reported in the Sunday Times and obtained by the BBC, highlight narrowing murder rates between the two cities, which have similar population sizes.
City Hall says it is "deeply concerned" by knife crime in the capital, but, along with the Met Police, insists London "remains one of the safest [cities] in the world".
London/New York murders
In January, the Met investigated eight murders whereas the NYPD looked into 18 killings
By February, the NYPD's figures had dropped to 11, while London's rose to 15
In March, 22 murders were investigated in London while 21 inquiries were launched in New York
The Met said it was "concerned at the increase in murders in London".
"One murder is one too many, and we are working hard with our partners to understand the increase and what we can all do to prevent these tragedies from happening in the first place," a spokesman said.
However, it is a murder rate that has left Mr Logan feeling "absolutely devastated".
Leroy Logan MBE
Image caption Former Ch Supt Leroy Logan retired from the Met Police in 2013 after 30 years' service
"I cannot understand how things have gotten out of hand," he said.
"We have seen the virus of violence spreading. It is endemic in so many different parts of societies.
"It can only be dealt with in a holistic manner, because it is so holistic in its impact.
"Police can't just arrest or stop and search their way out of this problem; it has to be done in partnership with the communities."
Youth club leader describes an ‘increasing level of violence’ amongst teenagers.
Image caption Youth club leader describes an ‘increasing level of violence’ amongst teenagers.
The Met Police has launched 44 murder investigations in 2018, 31 of which have been as a result of stabbings.
The deaths of 47-year-old Laura Cecilia Navarrete De Figueira, from Twickenham, and her sons Claudio, 10, and Joaquin , seven, are part of the same Met Police murder investigation. She was found stabbed in London, while the boys were discovered dead, along with their father, at the foot of Birling Gap, in Sussex.
Croydon Central MP Sarah Jones, who chairs the all-party parliamentary group on knife crime, told the BBC's Today programme that London could learn from New York in how to reduce violent crime.