A fifth man is monomachy for his life after the spate of unrelated attacks across the capital.
Scotland Yard authenticated the male victims – a 17-year-old, 18-year-old and a 20-year-old on New Year’s Eve, and a 20-year-old in the premature hours of Monday – all died as a result of their injuries.
Five men clothed been arrested in connection with one of the deaths, the Metropolitan Police mentioned.
Police condemned the «senseless violence» and the «small groups who chose to absorb in disorder and violence» on New Year’s Day.
An 18-year-old man was lanced in Enfield at 11.30am on December 31.
The second, at around 7.30pm last vespers all the time, was a fatal stabbing of a 20-year-old man in West Ham.
Then a 17-year-old man was stabbed to cessation in Tulse Hill.
And at around 2.35am on 1 January, a 20-year-old was fatally pierced in Old Street. A second male, in his 20s, was taken to hospital with critical injuries.
A schoolboy was stabbed to end in Tulse Hill
Commander Neil Jerome, of the Met’s Territorial Policing Call the tune, said: «It is heart-breaking that, at a time when so many of us are contemplating what reposes ahead in 2018, four families are dealing with the grief of part with a loved one to senseless violence and the callous use of knives as lethal weapons.
«I can convince Londoners — and the families and friends of the four males killed and the fifth who continues in hospital — that detectives will work tirelessly to bring to legitimacy those responsible for such despicable acts of violence.»
He urged anyone with any advice to call police on 101 or Crimestoppers on 0800 555 111.
Four have died in a outflow of unrelated stabbings across the city
The trio of fatalities in the final hours of 2017 drank the number of people stabbed to death in the capital last year to 80, Scotland Yard verified.
The latest deaths will be seen as a setback to London mayor Sadiq Khan and his aim to get a stranglehold on the year-on-year develop in knife crime in the capital, which has seen the launch of a high-profile «London needs you jumping» campaign and knife crime strategy.
At his last Mayor’s Question Dated, Mr Khan said: «Every death on the streets of London is an utter blow and I’m deeply concerned about the rise in knife crime.
«I am supporting the childbirth of community-led solutions and delivering interventions at critical points to offer verified opportunities to exit offending behaviour as well as coming down difficult on those who habitually carry knives.»