Police have vowed to meet "force with force" after having to break up a wild party attended by hundreds of revellers.
Acting Police Commissioner Chris Dawson said it was one of the worst out-of-control parties the State had seen for several years.
But some of those who attended used Facebook to describe the violent event as one of the best parties "in a long, long time".
Several partygoers have posted on the Facebook pages of two teenage boys who organised the event expressing their thanks for hosting the gathering saying it was "mad" and suggesting the boys stage another party soon.
More than 70 police officers, including police dogs, horses and the airwing were called to quell about 500 people at a disused shed on Warton Road in Piara Waters in Perth's southern suburbs about 9pm on Saturday.
Officers were pelted with bricks, bottles and poles as they attempted to move on the group of mainly drunk juveniles.
In the lead-up to the event would-be attendees posted on the organisers' Facebook pages asking about invitations and how much they would be charged to attend.
One of the boys, a 17-year-old student, said he acknowledged he had a part to play in hosting the party but was simply helping his friend attract people to the event.
The teenager threw a similar-sized party last week for his birthday, which was also broken up by police. The boy said he and the other organiser left when things got out of hand.
"We had a bad gut feeling about it," he said. "We thought we should probably go so we baled on it."
A 19-year-old Canning Vale man who was stabbed after an altercation as he picked up his younger brother from the party remains in a serious but stable condition at Royal Perth Hospital. Police are still searching for the offender.
A 15-year-old has been charged with criminal damage and assaulting a public officer after he allegedly smashed the window of an ambulance that was being driven through the crowd to get to the stabbing victim.
"I have an expectation that the courts will deal with these people and deal with them as the community expects them to be dealt with," Mr Dawson said. "This is serious criminal offending that we are alleging, this is not a party, this is a serious criminal assembly."
Police Minister Liza Harvey said she expected to introduce legislation into Parliament that would have organisers of out-of-control parties prosecuted as well as making it an offence when people failed to disperse on police orders.Police have charged six others, including three juveniles, with unlawful assembly.
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