A 20-year-old man was stabbed to death and found on Roth Walk near Finsbury Park at around 3am on Saturday, Scotland Yard said.
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Police have also launched a separate murder investigation after a man died following an assault in Morden on Thursday.
Police were called to Thursday’s incident after ambulance staff suspected a man collapsed on London Road had been assaulted.
The 32-year-old man was taken to a south London hospital in a critical condition and died the next day.
Police say the victim was involved in a fight with a man in the street.
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A 31-year-old man has been arrested on suspicion of murder and remains in custody.
Officers arrived at Saturday’s incident in Finsbury Park following reports of a stabbing on Seven Sisters Road.
A 21-year-old man was found at the scene suffering from stab wounds, but a short distance away a second man, aged 20, was found stabbed and was pronounced dead at the scene despite efforts by medics to save him.
The 21-year-old was taken to hospital for treatment and later discharged.
He has been arrested on suspicion of murder, possession of an offensive weapon and affray and remains in custody.
Police believe the men had been involved in an altercation involving a number of other people in the area of Roth Walk.
On the Finsbury Park attack, Mayor of London Sadiq Khan said he was “deeply saddened”.
“The Met Police are using extra City Hall resources to fight this scourge and to remove violent criminals and weapons from the streets,” he said.
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“We are also working tirelessly with the Met Police, community and youth groups, health and education services, and local and national government on preventing young people getting dragged in to lives of violent crime.”
The two violent deaths bring the number of victims this year to 58, sparking concerns about the capital’s rising murder rate.
Finsbury Park – Anyone who witnessed this incident is asked to call police via 101 quoting reference CAD1054/21APR, tweet @MetCC, or call Crimestoppers anonymously on 0800 555 111.
Morden – Anyone with information about this incident is asked to call 020 8721 4054 or Crimestoppers.