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Three teenagers were found stabbed within minutes of each other in northeast London .
The first victim, a boy believed to be 15-years-old, was found with a stab wound in Waltham Forest on Monday afternoon.
Within minutes police were called to a nearby address where two 19-year-old men were also found with stab wounds.
All three victims were taken to hospital where their condition is not yet known.
Four arrests have been made, Scotland Yard said.
Show all 21 1 /21The teenagers murdered in London in 2018 The teenagers murdered in London in 2018 Oluwadamilolda Odeyingbo Oluwadamilolda Odeyingbo, 18, was killed in a fight in Chislehurst on 10 January 2018
Metropolitan Police
The teenagers murdered in London in 2018 Hasan Ozcan Hasan Ozcan, 19, was stabbed to death on the Gascoigne Estate in Barking on 3 February 2018
Metropolitan Police
The teenagers murdered in London in 2018 Sabri Chibani Sabri Chibani, 19, was stabbed fatally in the chest in Streatham on 11 February 2018
Metropolitan Police
The teenagers murdered in London in 2018 Promise Nkenda Lord Promise Nkenda, 17, was stabbed to death in Canning Town on 14 February 2018
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The teenagers murdered in London in 2018 Lewis Blackman Lewis Blackman, a 19-year-old rapper from Kentish Town, was stabbed to death in Kensington on 18 February 2018
Metropolitan Police
The teenagers murdered in London in 2018 Abdikarim Hassan Abdikarim Hassan, 17, was stabbed to death near his home in Camden's Peckwater estate on 20 March - less tahan two hours before another man was stabbed to death nearby
Metropolitan Police
The teenagers murdered in London in 2018 Kelvin Odunuyi Kelvin Odunuyi, a 19-year-old rapper known as DipDat and Lampz, was shot dead in Wood Green on 8 March
Metropolitan Police
The teenagers murdered in London in 2018 Lyndon Davis Lyndon Davis, 18, was chased down and stabbed to death in Chadwell Heath on 14 March
Metropolitan Police
The teenagers murdered in London in 2018 Tanesha Melbourne-Blake Tanesha Melbourne, 17, was killed in a drive-by shooting in Tottenham on 2 April
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The teenagers murdered in London in 2018 Amaan Shakoor Amaan Shakoor, 16, was shot dead in Walthamstow on 2 April
Metropolitan Police
The teenagers murdered in London in 2018 Israel Ogunsola Israel Ogunsola, 18, was stabbed to death in Hackney on 4 April
Metropolitan Police
The teenagers murdered in London in 2018 Rhyhiem Ainsworth Barton Rhyhiem Ainsworth Barton, a 17-year-old rapper and aspiring architect, was shot dead in a Kennington Street on 5 May
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The teenagers murdered in London in 2018 Jordan Douherty Aspiring rapper Jordan Douherty died of his injuries outside a birthday party in Romford on 23 June
Metropolitan Police
The teenagers murdered in London in 2018 Katrina Makunova Katrina Makunova, 17, was stabbed to death in Camberwell on 12 July 2018
Metropolitan Police
The teenagers murdered in London in 2018 Latwaan Griffiths 18-year-old Latwaan Griffiths was fatally stabbed on 25 July and died in hospital after being thrown off the back of a moped in Camberwell
Metropolitan Police
The teenagers murdered in London in 2018 Guled Farah Guled Farah, 19, was shot in Walthamstow on 22 September
Metropolitan Police
The teenagers murdered in London in 2018 Ethan Nedd-Bruce Ethan Nedd-Bruce, 18, died after he was shot outside a party at a flat in Greenwich, south-east London, on 22 October. He had also been stabbed, but the gunshot wound was the cause of death.
Metropolitan Police
The teenagers murdered in London in 2018 Jay Hughes Jay Hughes, 15, died was fatally stabbed outside a chicken shop in Bellingham, south-east London, on 1 November
Metropolitan Police
The teenagers murdered in London in 2018 Malcolm Mide-Madariola Malcolm Mide-Madariola, 17, was found suffering from a stab wound outside Clapham South Tube station on 2 November
Metropolitan Police
The teenagers murdered in London in 2018 John Ogunjobi John Ogunjobi, 16, died in front of his parents after he was stabbed in Greenleaf Close, Tulse Hill, on 5 November
Metropolitan Police
The teenagers murdered in London in 2018 Aron Warren Aron Warren, 18, was found stabbed in a flat block in Greenwich on 8 December and died at the scene
Metropolitan Police
The stabbing follows a spate of knife attacks across the capital.
Last week a man appeared in court in connection with five knife attacks that took place in Edmonton, north London.
One of the victims, a 45-year-old woman, was left paralysed after her spinal cord was severed in the attack.
In Waltham Forest 14-year-old Jaden Moodie was stabbed to death earlier this year after a group of five men in a black Mercedes rammed him off a moped, police believe.
Anyone with information is asked to call police on 101 or Crimestoppers anonymously on 0800 555 111.
