A teenage boy was stabbed to death outside a suburban primary school on Easter Monday.
The victim, 17, was found dying from a single stab wound in Longshaw Road, Chingford at 9.20pm.
Paramedics, police and neighbours fought to save the teenager but he was declared dead at the scene.
A murder investigation has been launched, the Metropolitan Police confirmed, but no arrests have yet been made.
A Met spokesman said: “Officers were on the scene within three minutes along with paramedics from the London Ambulance Service and London’s Air Ambulance.
“They found a 17-year-old boy with a stab wound.
“Despite the efforts of members of the public and the emergency services, he died at the scene.
“His next of kin have been informed.
“An investigation is underway and enquiries are ongoing.”
Forensic teams were seen sweeping the area outside the front gates to Longshaw Primary School on Tuesday morning.
Police have also sealed off an overflowing clothes bank on a high street.
One dog walker told the Standard: “I feel so sad for someone so young to lose their life like that. It could have been my boyfriend.”
Detectives are reviewing CCTV from the area and carrying out door-to-door enquiries, Met Police said.
Chief Superintendent Simon Crick, local policing commander for north-east London, said detectives have been working through the night and today carrying out further enquiries.
“This is a tragic incident and I am devastated that a young life has been lost as a result of knife crime. My thoughts are with the victim's family at this incredibly difficult time. Incidents such as this have a devastating impact on families, friends and our local communities,” Mr Crick said.
He added: “We have a dedicated team of detectives working on the investigation. They have been at the scene overnight and will remain there today as they carry out further enquiries. This work is being supported by additional local patrols who are there to respond to any concerns within the community.”
Any witnesses are asked to tweet @MetCC or call 101 quoting CAD 6358/10Apr.
To remain anonymous contact the independent charity Crimestoppers on 0800 555 111.
