Police have given violent revellers from Saturday night's out-of-control party a chance to hand themselves in, warning they will be tracked down one by one if they do not.
Seven people have already been charged and Acting Insp. Chris Adams said dozens more could face charges after investigators scoured footage taken of officers being pelted with bricks, bottles and poles as they tried to disperse hundreds of mainly drunk youths who had been partying in a disused shed in Perth's southern suburbs.
As police launched Operation Esryn to target troublemakers from the wild gathering, event organiser George Peppas, 17, condemned the way revellers behaved. "You have to have no heart to attack an ambulance," he said.
Mr Peppas said he cancelled the event on Facebook about 8pm when he saw it getting out of control. "Things were getting stupid," he said.
Police Minister Liza Harvey claimed legislation to tackle problem parties was her top priority and she hoped to introduce it to Parliament next week.
WA Police Union president George Tilbury said new laws were needed to protect police from alcohol-fuelled violence and antisocial behaviour at such parties.
But he said the union had not yet seen any details of the proposed laws so was not sure if it would support the legislation. A bigger priority for union members was for legislation that protected them during emergency driving, pursuits and when criminals evaded police.
It took more than 70 police officers about four hours to control the mob on Saturday after they were called to the private property in Piara Waters. Up to 500 people were at the event organised by Mr Peppas and two other teenage boys.
A window of an ambulance was smashed as it drove through the crowd to reach a teenager who had been stabbed after an altercation as he picked up his younger brother from the party.
"To throw bricks and glass and signposts and debris at police officers, to damage community property, quite frankly is just unacceptable," Acting Insp. Adams said. "If they don't hand themselves in, we will find them."
The Opposition said the Government was taking too long drafting the legislation. Shadow police minister Michelle Roberts said the Government was promoting the laws as an election strategy but failing to bring them to Parliament.
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