A young man has been stabbed to death in the 39th fatal knife attack in London this year.

The 20-year-old was pronounced dead at the scene in north London in the early hours of Saturday morning, police said.

Scotland Yard said medics fought to save his life but he was pronounced dead at the scene in Roth Walk, Finsbury Park.

Another man, aged 21, was also found with stab wounds in nearby Seven Sisters Road and was taken to hospital in a non-life threatening condition.

He was later arrested on suspicion of murder, affray, and possessing an offensive weapon, police said.

In a post on social media, the victim’s sister made an emotional appeal for an end to the bloodshed on London’s streets after the killing in Labour leader Jeremy Corbyn’s constituency.

She wrote: “My younger brother, my only brother got stabbed to death this morning. Guys this needs to stop. The pain I’m experiencing is indescribable”.

Another friend tweeted: “Heart shattered in to a million pieces. Stabbings are just statistics until they happen to a loved one”.

Mayor of London Sadiq Khan posted online about the killing, saying he was "deeply saddened" by "another life unnecessarily lost to violent crime on our streets".

He said: "The Met Police are using extra City Hall resources to fight this scourge and to remove violent criminals and weapons from the streets.

"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."

Speaking at a St George's Day event in Trafalgar Square on Saturday afternoon, Mr Khan urged anyone with information to come forward.

He said: "There is no honour in staying silent when you know something.

"There is no honour in allowing someone to carry a knife that can lead to harm being caused. All of us have a responsibility to help the police keep us all safe."

Islington council’s leader Richard Watts added: “Very sorry indeed to hear about the murder on the Andover estate last night. I’m in touch with @MPSIslington, @jeremycorbyn and ward councillors. Thoughts clearly with the victim’s family.”

The young man’s death came amid a surge in violent crime in the capital which has seen Scotland Yard launch more than 60 murder inquiries so far in 2018.

A separate murder probe was under way today after a man died following an assault in Merton on Thursday night.

The 32-year-old was found collapsed in London Road but died in hospital on Friday night, according to police. A 31-year-old man was arrested on suspicion of affray.

A Scotland Yard spokeswoman said police had been called to the scene of the stabbing in Finsbury Park at about 3am.

“A 21-year-old male was found at the scene suffering from stab wounds,” she said. “He was taken to a north London hospital where his condition is not life threatening.

“A short distance away at Roth Walk, N7, a second male, aged 20, was found suffering from stab wounds. Despite the efforts of medics, he was sadly pronounced dead at the scene.

“Enquiries are under way to trace next of kin.

“The 21-year-old injured male was arrested on suspicion of affray.”

Anyone who witnesses this incident is asked to call Central North Command Unit by dialling 101, tweet @MetCC, or call Crimestoppers anonymously on 0800 555 111 quoting reference CAD1054/21APR.