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A house party on Sydney's affluent Upper North Shore ended in violence overnight when two men, including the host, were hospitalised in an alleged stabbing attack.
Emergency services were called to North Turramurra about 2am after an alleged brawl broke out at the multimillion-dollar Stephanie Place home.
One 28-year-old man, believed to be a guest, suffered several stab wounds to the chest and stomach.
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The party's host, identified as 31-year-old Matthew Harper, was allegedly knifed in the leg.
"I woke up and it was like people sounding like they were having a punch on," a witness told 9News.
Another witness said they heard girls screaming and running onto the road.
"It was quite scary, yeah, I just thought it was some people that had been to a party, but then it got really nasty," said a neighbour.
Police located a bloody knife outside a nearby home on Somerset Avenue.
A 30-year-old man was arrested and taken to hospital under police guard for treatment of facial injuries.
The two victims remain at Royal North Shore Hospital in a stable conditions.
Residents told police parties were becoming a regular occurrence on the street but that they didn't recognise the men.
They said loud music could be heard about midday yesterday with initially 20 people gathering but 12 hours later shouting and screaming began.
"They didn't look like people who are from the neighbourhood to be honest," one person said.
