A double murder investigation has been launched after two 17-year-old boys were stabbed to death.
Two men were also injured in the “shocking” incident in Milton Keynes and are in hospital with what are described as serious, but not life-threatening injuries.
Police were called to reports of a stabbing at a property in Archford Croft, Emerson Valley, shortly before midnight on Saturday.
One teenage victim died at the scene, while the other was taken to hospital with serious injuries but died later.
There have been no arrests and next of kin have been informed.
A neighbour who knew the victims suggested the stabbing was linked to a house party which had been held in the area.
What appeared to be blood could be seen smeared across the front door of the address.
The crime scene was cordoned off on Sunday as forensic teams carried out their fingertip search.
One neighbour said she heard a “commotion” involving screaming shortly before midnight but did not see what happened.
“The police were here pretty quick,” she said.
Another neighbour, who lives in a neighbouring cul-de-sac, said that she know the boys but declined to give their names.
She said: “This gang of kids have been hanging around Archford Croft – it’s all gang-related.
“We do know that there was a house party at the time, not here but another part of Emerson. I think it’s just because there was a house party and then the trouble started from there.”
She said of the two boys: “I think they were friends but that’s all we know. It’s just because our kids all go to the same school together.”
One woman, whose home overlooks the property’s garden, said she did no see or hear anything and described the neighbourhood as “peaceful”.
“It’s just a nice peaceful part of Milton Keynes. There’s never been any incidents, not since I’ve been here, which is quite a while now,” she said.
Detective Chief Superintendent Ian Hunter said: “Thames Valley Police is in the early stages of a double murder investigation after two teenage boys have tragically died in this shocking incident.
“Our priorities at this time are to conduct a thorough investigation and to support those who have been affected.
“Officers are currently at the scene which has been cordoned off and members of the public are asked to avoid the area.
“I would like to speak to anyone who has any information which could help with our enquiries or anyone who witnessed any suspicious activity in the area of Archford Croft at around the time of the incident around midnight.
“Even if you think details may be insignificant, please come forward and speak to police.”
Anyone with information should call police on 101, quoting URN 1761 19/10, or contact Crimestoppers anonymously on 0800 555 111.