A large crowd of people gathered for a vigil at a park in north-east London in memory of a 16-year-old boy stabbed to death on New Year's Eve.
Harry Pitman, from Haringey, was stabbed in Primrose Hill, north London, just before midnight on 31 December.
On Tuesday, mourners, including Harry's mother, brother and sister met in Downhills Park, near the family home.
Police officers could be seen patrolling the perimeter of the park.
A 16-year-old boy arrested on suspicion of murder has been released on bail pending further inquiries.
London's independent victims' commissioner, Claire Waxman, described the death as "a senseless tragedy".
She added: "I'm aware that a group of residents has raised concerns with the Royal Parks about a rise in violence and anti-social behaviour in the Primrose Hill area over the last couple of years."
Earlier, Tayla Pitman, Harry's older sister, said the family was "devastated".
Tayla told the MailOnline: "I keep on expecting him to come through the front door. His dinner is still in the oven, mum can't bring herself to remove it."
She added: "I'm devastated, he was my baby brother."
Harry's 18-year-old brother Patrick told The Times: "The night before he was killed we were playing video games and reminiscing because we are getting older, though now he is never getting any older."
Alex Rosen, head of St Thomas More Catholic School, said Harry was a "beloved former pupil" who was a "bright and promising young soul".
"Harry touched the lives of many with his infectious laughter and enthusiasm for life," he said.
"He will be remembered for his many qualities, particularly his resilience and the positive impact he had on those around him.
"Our thoughts and prayers are with Harry's family during this heart-breaking time. May he rest in peace."
Detectives investigating the incident appealed for photos and videos from the park where Harry was attacked.
Supt Danny Hewitt, from the Met Police, said: "We need to hear from anybody who saw anything that may be significant."
He said a "large group of people" had gathered at the park to see in the new year and watch London's fireworks when Harry was killed.
"If you have not yet come forward please make contact now. I know that many people have images and footage from Primrose Hill, especially around the time of the murder," he added.
"I urge them to share that material with us by the dedicated link in our appeals."
He said his thoughts were with Harry's family, who are being supported by a dedicated team.
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