A murder investigation is under way after the death of a man found with stab injuries.
Police were initially called at 2.47am to reports of a large group of men fighting in Haselbury Road, Edmonton, north London, Scotland Yard said.
When they arrived, officers found a man suffering from stab injuries. Police provided first aid until paramedics arrived, but the man, aged in his 20s, was taken to hospital. He later died from his injuries.
Four teenage males have been arrested in connection with the incident and have been taken to north London police stations where they remain in custody.
A post-mortem examination will be held in due course, and police said the identity of the victim is known but formal identification is yet to take place.
Anyone with information that may assist the investigation should call the incident room on 020 8358 0200. To remain anonymous, call Crimestoppers on 0800 555 111.
A picture of Palmira Silva, 82, who was killed in north London in an apparent beheading, has been released by the Met Police.
A neighbour who knew victim 82-year-old Palmira Silva said she was "such a sweet lady" who still went to work every day in a nearby cafe.
The woman, who did not wish to be named, said she had known her since 1987, adding that she was left "devastated" by the news.
Police investigating the death of a woman, thought to have been beheaded in Edmonton, London, have named her as 82-year-old Palmira Silva.
A Met Police commander has said that officers discharged tasers when arresting a man on suspicion of murder, after reports that a woman's body was found in a back garden in London.
Commander Simon Letchford said officers were called at 1pm this afternoon to reports of a man carrying knife. He said: "During the arrest officers did discharge tasers and at least one firearms officer has been injured with we believe a broken wrist."
Police say that the motive of the attack is still under investigation but reiterated that they do not believe it to be related to terrorism.
Police have confirmed that the family of a woman killed in a knife attack in Edmonton have been notified by specially-trained liaison officers.
Forensics officers were pictured at the house in Edmonton where a woman is believed to have been beheaded in a knife attack.
Andy Love, the MP for Edmonton, has spoken of his shock at the apparent beheading of a woman in the area.
Mr Love reiterated the Metropolitan Police's assurances that the attack happened with "no suggestion of a terrorist motive".