Murder police are investigating a double stabbing in Old Street that left a man dead early this morning – one of four fatal knifings across the capital within the space of hours.

A 20-year-old man was stabbed to death and a second man was left fighting for his life after they were attacked in Bartholomew Court in Old Street, at around 2.30am this morning.

Three other young men were stabbed to death on New Year’s Eve.

An 18-year-old was stabbed in Enfield at 11.30am.

He was rushed to hospital but later died from his injuries.

At about 7.30pm last night a 20-year-old was stabbed to death in West Ham, and three hours later a 17-year-old boy died after he was stabbed in Tulse Hill.

Detectives from the Met’s homicide and major crime command are investigating all four murders as separate incidents.

Cdr Neil Jerome, from the Met’s territorial policing command, said: “There were thousands of officers on duty across London yesterday and throughout the night, all determined to play their part in keeping the public safe.

“I am grateful to Londoners and visitors to the capital who co-operated with police - both at major celebrations in Westminster and at thousands of organised and private events across London - to enable the vast majority of people to enjoy New Year’s Eve.

“However, there were small groups who chose to engage in disorder and violence, and whose actions have had utterly tragic consequences.

“It is heart-breaking that, at a time when so many of us are contemplating what lies ahead in 2018, four families are dealing with the grief of losing a loved one to senseless violence and the callous use of knives as lethal weapons.

“I can assure Londoners – and the families and friends of the four males killed and the fifth who remains in hospital – that detectives will work tirelessly to bring to justice those responsible for such despicable acts of violence.

“As we begin these investigations and the provision of support to four grieving families, days like this serve to re-enforce the determination of the Metropolitan Police to tackle knife crime and violence on our streets; especially offences committed by and against young people.

“I would urge anyone with information about these attacks, and more generally about anyone who routinely carries a knife, to urgently pass that information to police or Crimestoppers.

“If you’ve hesitated to do so before, then these four tragic deaths at the start of a new year may persuade you to act now to make London safer for your family and friends in 2018.”

Anyone with information can call police on 101 or call Crimestoppers anonymously on 0800 555 111.

Five males have been held in connection with the Enfield murder but there have been no arrests in the other three killings.