Two "best friends" were "lured" to a suburban house party where they were "targeted" and stabbed to death, a neighbour claims.
The 17-year-old victims, named locally as Dom Ansah and Ben Gillham-Rice, were knifed at a party where about 20 people were apparently celebrating a birthday.
Heartbroken family members and friends have paid tribute to the pair, including one woman who pleaded: "Knife crime needs to stop."
A woman whose son was at the party in Milton Keynes, Buckinghamshire, said one of the victims had "died in his arms" and claimed the alleged double murder was "gang related".
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She told the Telegraph: “They were his friends. It’s gang related. Those boys were lured there and targeted.”
A grief-stricken woman, who identified herself as a cousin of Dom, wrote on Facebook : "Heartbroken!! To lose these two boys I've grown up with ... my little cousin!
"Gone far far to soon!"
She said the teen had been "robbed" of their lives, adding: "Knife crime needs to stop. This is crazy!
"May you gorgeous boys rest in peace."
Two tearful cousins of one of the boys attended the site of the killing to lay flowers on Sunday.
One of the cousins, who did not wish to give her name, said: "He's come here with his long-time best friend since childhood, comes to a party and both of their lives just got ripped away from them.
"He was just so respectful to, like, his family and friends.
"Many, many people's hearts are broken."
Police, who have not announced any arrests in the double murder investigation, were called to the scene just before midnight on Saturday.
One of the boys died at the scene, while the other was taken to hospital but died in the early hours of Sunday.
Two other males, one aged 17 and one aged 23, were also injured.
Blood was smeared across the front door of the house.
One neighbour, who did not want to be identified, told the BBC she believed the gathering was a party for a teenage girl living in the house.
Others had said a birthday banner was hanging on the door.
Detective Chief Superintendent Ian Hunter said there had been about 15 to 20 people at the party.
He added: "Clearly this is a dreadful incident and we are in the very early stages of the investigation.
"Our thoughts go out to the families of the victims and we have deployed specially trained officers to support them.
"I fully appreciate the concern that this will cause in the local community and beyond, but at this early stage, I believe the people directly involved in this incident are all likely to have known each other.
"There will be an increased police presence in Emerson Valley and if you have anything you wish to raise, or any concerns, please don’t hesitate to speak to officers."
