A 28-year-old man who was shot and killed at a rally in east London has been named Sam Brown.
Police were called to Cheney Row Park, Waltham Forest at around 12.30pm on Sunday to reports of gunshots.
Shortly after, two men, including Mr Brown, attended a hospital in east London.
Mr Brown, of Waltham Forest, later died of gunshot wounds.
The other man, in his thirties, had been stabbed. He was later released from hospital and was arrested in connection with the incident.
Detectives are conducting a murder investigation in connection with Mr Brown’s death.
Police have urged all witnesses to remember his “grieving mother and father” and help them with their investigations.
Residents near Cheney Row Park said they expected trouble when they saw groups arriving in the area.
One man, who did not want to be named, said: “We live around the corner so we didn’t see anything, but I saw earlier more and more children showing up, so we thought…there would be a fight.
“We didn’t think it would be anything like this.”
Another resident, who also did not want to be identified, said he had to drive his young daughter home from the park around 5 p.m., claiming that a group of teenagers had “smoked weed” and taken other drugs since early afternoon.
He said, “There are always problems here.”
A large cordon remains in place around the park and surrounding streets as officers conducted door-to-door surveys in the area.
A forensic team is also on site.
Chief Detective Inspector Kelly Allen, who is leading the investigation, said: ‘My heart goes out to Sam’s family, who lost their lives in this reckless act of violence. I can assure them of my total dedication, and that of my team, so that they obtain justice.
“I believe there were 50-100 people gathered in and around Cheney Row Park at the time of filming with music playing. I urgently need to speak to everyone who was present at this event – even if you don’t think you saw anything of significance, you must come forward and speak to the officers.
“There will have been footage and footage captured at the event, and we need to see it. Please ensure that all of this material is saved – we will provide a link for it to be downloaded shortly.
“To anyone considering whether or not to report to the police, I ask that you put yourself in the shoes of the grieving mother and father of the victim this morning. They deserve answers.
“And anyone who has brought a gun to a gathering like this does not deserve your protection, nor does he deserve to be free to inflict further harm on others. Please do the right thing and contact us today.
Witnesses can contact the police on 101, quoting 267/24jul, or call Crimestoppers anonymously on 0800 555 111.