A teenager has been stabbed to death by two men who are thought to have fled on bicycles in what was the eleventh fatal knife attack in London in just two weeks.

The 17-year-old boy was ambushed by his attackers in Walthamstow, north London, as he walked down the road with a friend, according to police.

Officers were called to Walthamstow High Street just after 11.30pm on Sunday and found the victim suffering from a serious knife wound.

Scotland Yard believe the two men were 'laying in wait' for the pair and the injured boy was rushed to a hospital in a critical condition but later died.

The incident in Walthamstow (number 11 on the map) was the eleventh fatal stabbing in the capital in just two weeks

Police officers rushed to the scene after a 17-year-old boy was fatally stabbed in Walthamstow (pictured)

A murder investigation has been launched and the victim's family have been told about his death.

Detective Chief Inspector Matt Bonner said: 'We believe that two men were laying in wait for them. During the altercation that followed, the 17-year-old boy was stabbed.

'At this stage, we are investigating whether the two suspects left the area on bicycles.'

The unnamed teenager became the fourth person to be stabbed to death in the capital in just four days.

Police believe that the attackers were 'laying in wait' for the pair in Walthamstow (pictured) before they stabbed the teenager

A 23-year-old man died from a knife wound after being found unconscious by police in Uxbridge, west London, in the early hours of Saturday.

And on Friday, a man in his 30s was fatally stabbed following an incident at a barber shop in Harlesden, north-west London.

On Wednesday, the Metropolitan Police launched the latest phase in its campaign to crack down on on knife crime.

LATEST STABBING IS THE ELEVENTH FATAL KNIFE ATTACK IN LONDON May 7: 17-year-old boy, Walthamstow, May 6: 23-year-old man, Uxbridge May 5: Crispin Siddon, 35, Harlesdon May 4: Karolina Chwiluk, 20, Mile End May 2: Seun McMillan, 23, Oakwood April 28: 26-year-old, Peckham Rye April 28: Archie Sheppard, 38, Marylebone April 25: Abdullah Hammia, 24, Wandsworth April 24: Keith Sinclair, 60, Bow April 23: Mohammed Hasan, 17, Battersea April 22: Damien McLaughlin, 42, Enfield Advertisement

The force said it is tackling knife crime under its Operation Sceptre, which saw 73 arrests made for possession of an offensive weapon or knife during the past week.

Officers seized 300 knives, along with 62 offensive weapons and 15 firearms over the period.

Detective Chief Superintendent Michael Gallagher, the Met's 'silver lead' for knife crime, said: 'This operation carries a positive and powerful message: this is about all of us addressing a problem that often has tragic consequences.

'This behaviour is damaging our communities; there is no excuse, people are better than this and our communities are better than this.'

Mayor of London Sadiq Khan said: 'Today, I want to send an unequivocal message that carrying knives will simply not be tolerated on London's streets, and I am calling on everybody in London to work with the police to help root out this scourge.

'Every life lost is an utter tragedy and my thoughts are with the families and friends of all those who have so needlessly lost their lives.

'My message today is clear: if you carry a knife in London, we will catch you and arrest you.'

Anyone with information about any of the incidents is asked to contact police on 101 or call Crimestoppers, anonymously, on 0800 555 111.