Metropolitan Police officers have launched a murder inquiry after an 18-year-old was stabbed to death at a street in Westminster.
Police were called at approximately 10.40pm on Thursday 8 January, to Salisbury Street, following reports of a stabbing.
London Ambulance Service rushed to the scene and treated an 18-year-old man for stab wounds. He was taken to a central London hospital but was pronounced dead at 11:24pm.
Next of kin have been informed but a formal identification is yet to take place. A post-mortem examination will be held in due course.
A group of youths were spotted running away from the murder scene. At 3am on Friday (9 January) a 16-year-old boy was arrested on suspicion of murder and remains in custody after he attended a central London police station.
Detective chief inspector Noel McHugh, said: "I would urge anyone who was in the Salisbury Street area and witnessed what happened to come forward and speak with police.
"I know that there were several youths in the area at the time of the stabbing and I am appealing directly to them to come forward and speak with officers.
"I would also like to speak with anyone who saw this group running south towards Edgware Road."
Anyone with information is asked to contact the incident room on 020 8785 8009 or Crimestoppers anonymously on 0800 555 111.