Five teenagers were stabbed at a Halloween house party after a group gatecrashed the event.
The incident happened in Chandler’s Ford, Eastleigh, late on October 31, at a property on Park Road.
Hampshire police were called at around 10.30pm, where they found five teenagers, three aged 16 and two aged 17, with serious injuries.
Detectives have confirmed that a group gained entry to the party without invitation, but no arrests have been made so far.
As of Sunday evening, a large police cordon remained in place, stretching from Park Road to Valley Road and Merdon Avenue.
Officers have been conducting door-to-door enquiries, gathering CCTV footage, and speaking with witnesses as part of the ongoing investigation.
Detective Chief Inspector Elizabeth Pirie, the senior investigating officer, said her team was "already hard at work" identifying anyone who was at the party who may be able to help.
"I understand the response the local community may have to hearing about this incident this morning, and I do not underestimate the impact our scenes will be having on those living in the area," she added.
"These scenes are vitally important for our enquiries and we are grateful to the understanding of our communities whilst we work to establish the facts.
"If you do have any concerns or information, then please do not hesitate to speak to us."
Eastleigh MP Liz Jarvis said: "My thoughts are with the victims and their families and the local community at this time and my thanks goes to the emergency services for their swift response.
"I know many people will be shocked and upset by what has happened.
"This area is generally very safe and welcoming.
"I hope that residents feel reassured that the police are doing all that they can and I would urge people not to speculate or share information from unverified sources."
Residents of Park Road and the surrounding area have expressed shock and disbelief.
One couple described the incident as completely out of character for Chandler’s Ford, while a nearby resident’s daughter, who said she knew one of the victims, said: "I heard they jumped the fence and started stabbing."
Mary Morton, 70, who lives on Park Road, said: "I had just gone to bed when all these flashing lights appeared.
"I thought it must be roadworks, I’d never have thought all these police van had showed up.
"People shouldn’t carry knives, should they?
"It makes everything more dangerous.
"I’ve lived in Chandler's Ford for 26 years and never seen anything like this."
Another resident, James, 38, said: "I heard a commotion last night and saw loads of teenagers in the street.
"It was like a party had just finished.
"There were girls crying and screaming."
Matt, 47, who lives within the cordon, said police knocked on his door at 1.30am.
He said: "This is really odd for our area.
"We moved here because it is so safe.
"At first I thought the police were trick or treaters trying it on a bit too late."
Angie McConnell, 67, said she arrived home at midnight to find seven police vans blocking the road.
She said: "Nothing like that happens here.
"It’s shocking and surprising.
"There were lots of children with their families at 7, trick or treating, having a lovely time."
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Debris from a party, including bottles of wine and beer, was still visible near the scene the following day.
Forensic officers have been seen working at the site, and yellow evidence markers are in place at the junction of Park Road and Merdon Avenue.
Hampshire police have urged anyone with information to come forward.
No arrests have been made at this time.
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