A schoolboy has been stabbed in the same spot where Steven Grisales was killed after remonstrating with conker-throwing youths.
The 15-year-old has been taken to hospital in a serious but stable condition after being attacked near Silver Street railway station in Edmonton, north London.
Two people have been arrested over the stabbing, Scotland Yard said. Detectives were said to be "unaware" of any link with the murder of 21-year-old Mr Grisales last week.
Police were alerted to the attack at 6.50pm yesterday to reports of a stabbing in College Close.
"Officers, London Ambulance Service and London's Air Ambulance attended," a police spokesman said. "A 15-year-old male was taken by air ambulance to an east London hospital.
"His injuries are serious, but not believed to be life-threatening."
Enfield CID officers are investigating. Officers said the two suspects remain in custody at north London police stations.
Mr Grisales, 21, was attacked as he made his way to Silver Street railway station last Wednesday.
He died the next day from a single stab wound to the heart.
A 15-year-old boy has been charged with his murder and appeared in court yesterday.
Father Andres Grisales said his son was a "great boy" whose brothers and sisters were "devastated" by his death.
A man in his 50s was also taken to hospital with stab wounds yesterday in an "unconnected" incident nearby on Victoria Road, police said later.
He is receiving treatment for non life-threatening injuries at an east London hospital.
Chief Superintendent Dave Tucker, the local borough commander, said: "Despite the understandable concerns and fears of local residents in Edmonton it is essential to recognise that Enfield remains a safe borough and, in reality, only a very small proportion of residents and visitors are affected by crime.
"Crime in Enfield has fallen over the last eight years and we have seen the most significant reductions in violent offences and serious assaults as well as gun and knife crime.
"At this stage there is no direct link between the two stabbing incidents and we retain an open mind regarding a possible link between the murder of Steven Grisales and the incident in College Close.
"We carry out specific activities to tackle this type of offending. One noticeable initiative involves the use of mobile metal detectors to prevent knife and weapon crime.