The 15-year-old boy stabbed to death in Bellingham was the victim of an "awful premeditated attack", police have said.
Jay Hughes, also known as Jai Sewell, was knifed in Bellingham, south-east London, on Thursday at around 5.20pm and died several hours later in hospital.
He was one of two young men to be killed in knife attacks in London with 24 hours of each other - marking the 114th and 115th homicides in the capital this year.
Murder detectives are now treating the death as premeditated as they appeal for witnesses to the planned attack, which took place at a takeaway less than 100 yards from his home.
Detective Chief Inspector Chris Soole said: "We know that this was an awful premeditated attack on a young boy who sadly lost his life as a result.
"I would appeal to anyone with information to get in touch with us.
"Those responsible must be caught and brought to justice. Any information passed to police will be treated with the strictest confidence."
The Standard reported earlier that the young man had been named locally as Jai Sewell, which is how he referred to himself on Facebook. Police said the family gave his name as Jay Hughes.
Childhood friend Tayla Ann Warwick, 19, said Jay was a "loving and thoughtful" boy who had loved roller skating and riding his bike.
"It's so shocking, I spoke to him the other day," she added.
"He was the kindest person, he was so loving and thoughtful, he was well known with everyone."
A 17-year-old boy was fatally stabbed outside Clapham South Tube Station in south-west London only hours later.
Medical staff worked to keep the teenager alive following the attack on Randlesdown Road in Bellingham but could not save him.
His aunt Rochelle, 32, said the boy - who lived nearby with his grandmother - had not been involved with gangs.
She added: “He said he was going out to get some food and he never came back. He loved riding his mountain bike, was very bright and brilliant at art. He wanted to be a cartoonist.
“He was basically a young boy who played out on his bike and met up with friends. It was a normal day it seemed, but he never came back we are heartbroken.”
A cordon was placed around Morley's chicken shop and other businesses on the road following the attack yesterday evening.
Hospital IT worker Thomas Coffie, 23, described desperate efforts by members of the public to save the teenager’s life.
He said: “I was passing the takeaway and saw him staggering with a wound. There was a slash in his jacket. I took my shirt off to put in the wound. He kept saying “man’s gonna die, man’s gonna die’.
“Then he stopped talking and slumped down I was covered in blood. A nurse who was passing car to help we did our best. It’s terrible.”
Five children in school uniforms placed flowers and cards on railings at the scene on Friday.
Deanne Wright lives in the area and said she used to see Jay on the bus every day.
The 36-year-old went to Morley's on Randlesdown Road after a friend told her about the incident, saying: "I saw him, he was on the floor, I saw him lying there.
"I just know he was a sweet little boy."
A woman who asked not to be named said: "I don't know if he was involved in a gang but I live here and I never thought Bellingham was coming to this.
"I'm just upset because the first thing I thought was that it was my son. I was on my way to Morley's to get food for my kids, I thought it was my son but it wasn't."
A Section 60 order - which allows police officers in the area to stop and search a person with suspicion - has been authorised in the wake of his death.
A post-mortem examination is scheduled to take place at Greenwich mortuary on Sunday.
