A man who was fatally shot in Waltham Forest at a gathering of up to 100 people has been named by police.
Two men checked themselves into hospital following the incident, with Sam Brown, 28, dying from gunshot injuries.
His family has been informed.
A second man in his 30s has been discharged from hospital after suffering from stab wounds.
Officers were called to Cheney Row Park in Waltham Forest shortly after midnight on Sunday morning, after reports of shots being fired.
DCI Kelly Allen of Specialist Crime at the Metropolitan Police said: “My heart goes out to the family of Sam, who has lost his life in this reckless act of violence. I can assure them of my total dedication, and that of my team, to ensuring that they get justice.
“I believe there were 50 to 100 people gathered in and around Cheney Row Park at the time of the shooting with music playing. I urgently need to speak with everyone who was at that event – even if you do not believe you saw anything significant, you need to come forward and speak with officers.
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“There will have been footage and images captured at the event, and we need to see these. Please ensure that all such material is saved – we will provide a link for it to be uploaded shortly.
“To anyone considering whether or not to come forward to police, I ask you to put yourself in the position of the victim’s grieving mother and father this morning. They deserve answers.
“And whoever took a gun to a gathering like this does not deserve your protection, nor do they deserve to be free to inflict further harm on others. Please do the right thing and make contact today.”
Anyone with information is asked contact police on 101, quoting reference 267/24jul – or call Crimestoppers anonymously on 0800 555 111.