Four people have been stabbed to death during a string of apparently unrelated murders in London during a 24-hour period.

Scotland Yard confirmed the male victims - a 17-year-old, 18-year-old and a 20-year-old on New Year's Eve, and a 20-year-old in the early hours of this morning - all died as a result of their injuries.

A fifth man is in a critical condition an incident in the early hours of this morning.

Five men have been arrested in connection with one of the deaths, the Metropolitan Police said.

Met Commander Neil Jerome said the incidents, which took place in various locations across the city, were not connected.

He added: "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."