Three men have been stabbed to death during a bank holiday weekend of bloodshed across north and east London.
Police found a man in his late 50s injured at an address on Millicent Grove, Palmers Green, Enfield at 12.30am on Tuesday.
Despite the efforts of paramedics, he died at the scene.
In the same incident, a 16-year-old boy was treated by London Ambulance Service for stab injuries.
A 21-year-old man arrested on suspicion of murder and causing grievous bodily harm remains in custody at a north London police station.
Scotland Yard said: “A crime remains in place and enquiries continue.”
Separately, Metropolitan Police detectives are investigating a fatal stabbing in Waltham Forest on Monday night.
Police were called to a property in Cranstons Gardens, Highams Park at about 9pm following concerns for the welfare of a man inside.
Emergency services found a man, aged in his 40s suffering with stab wounds. Despite the best efforts of paramedics the man died at the scene.
A man and a woman were arrested at the scene in connection with the incident. They were taken into custody, where they remain.
The previous night, police found a 38-year-old man, named locally as Jack Hague, stabbed to death after a fight on Corfield Street, Bethnal Green at 8.20pm on Sunday.
He died at the scene despite efforts from the ambulance service to save him.
A post-mortem examination will be held in due course, the Met said.
There have been no arrests so far and police enquiries continue. A crime scene remains in place.
The murders come as Sadiq Khan kicked off his historic third term.
During the London mayoral election, Mr Khan’s record on knife crime came under scrutiny with parents of victims and rivals claiming he had lost control of the capital’s streets.
Official statistics show a 20 per cent rise in knife and gun crime last year.
Figures also show there has been a 38 per cent increase in knife offences since Mr Khan took office eight years ago.
Two days before the poll, 14-year-old Daniel Anjorin was killed and four people including two police officers seriously injured during a sword rampage in Hainault.
Daniel’s family said they were “devastated”, adding: “It is difficult for us at this time to process what has happened to him and that he will never come home. Daniel had left the house for school and then he was gone.
“Our children have lost their loving and precious brother and we have lost the most loved and amazing son.”
Daniel attended £23,000-a-year Bancroft’s School in Woodford Green where Nottingham attack victim Grace O'Malley-Kumar, 19, had also been a pupil before going university.
More than 300 people gathered at a vigil to pay tribute to Daniel who suffered fatal wounds to his neck and chest.
Marcus Arduini Monzo, 36, made his first appearance at the Old Bailey on Tuesday accused of murder, two counts of attempted murder, grievous bodily harm, aggravated burglary and possession of a bladed article.
Mr Khan said his priorities remain securing more funding for the police, and tackling the causes of crime by investing in young people to make London the “best city in the world to grow up in”.
A spokesman said: “Keeping Londoners safe is [his] No 1 priority, and he is investing a record £151 million in this year’s budget for policing and crime prevention.”
