Detectives have launched a murder investigation following a stabbing in Greenwich.
Police were called at 17:23hrs on Monday, 5 July to reports of a stabbing on Woolwich New Road, SE18.
Officers attended and found a 15-year-old boy suffering from a stab injury. They immediately provided first aid prior to the arrival of the London Ambulance Service.
Despite their efforts, he was pronounced dead at the scene at 18:08hrs. His next of kin has been informed. Formal identification has not taken place.
A post-mortem examination will be held in due course.
Police were subsequently called to a south London hospital after a 15-year-old boy [A] self-presented with a stab wound; his injury is not believed to be life-threatening. He was arrested on suspicion of murder and subsequently released with no further action.
Homicide detectives from the Specialist Crime Command are leading the investigation.
Detective Chief Inspector Perry Benton, of the Met's Specialist Crime Command, said: “We know that there were a lot of people around at the time who may have witnessed the events leading up to this incident.
"I'm sure people will have mobile phone footage from the scene and, if they believe it could assist our investigation, I would urge them to pass it on to us.
"One arrest has been made, but our enquiries are still at an early stage so I would ask anyone who knows anything about the motive for this attack, or who was responsible, to contact us immediately."
Superintendent Petra Lazar, of South East BCU, said: "It is shocking and extremely saddening that a teenage boy has lost his life as the result of knife crime.
"My thoughts at this time are with the family of the boy who has died.
"This incident will understandably cause worry and concern to local residents and I would like to reassure them my officers are supporting the murder detectives in every way we can. Increased patrols will be carried out in the area over the next few days."
A crime scene is in place and officers remain in the area. Enquiries continue.
Any witnesses are asked to call police via 101 quoting reference Cad 5748/05Jul. To remain anonymous, call Crimestoppers on 0800 555 111.
A section 60 Order has been authorised from 19:02hrs on Monday, 5 July until 10:00hrs on Tuesday, 6 July for Woolwich Common, Woolwich Riverside and Glyndon wards.