Police deployed helicopters, the riot squad and the dog unit to disperse a wild party of 150 teenagers in a vacant house in Sydney's south on Friday night.
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A police officer was hospitalised during a scuffle with partygoers, and a teenager was charged, following the incident at View Street, Gymea, NSW Police said on Saturday morning.
After receiving complaints about the party about 8pm on Friday night, police from Sutherland found 150 people partying in a vacant house.
Partygoers allegedly threw glass bottles and other projectiles at the police when they tried to find out who had organised the out-of-control party. One witness reported that party goers jumped fences into neighbouring backyards to escape the police.
To disperse the group, police deployed the riot and dog unit, and PolAir helicopters. But the sound of the choppers overhead alarmed locals, who took to social media to share information.
One nearby resident quipped that he had been trying to skinny dip - and the police helicopter's "spotty" was "killing the mood".
Another person responded that there were "kids scattered everywhere under age".
On Twitter, one person even shared the sound of the helicopter whirring overhead.
Police helicopter circling gymea, near premier st. Anyone knows what's going on? #gymea #sutherlandshire #police pic.twitter.com/dLC8CEaWm3— Sean Romer (@SeanRomer) May 6, 2016
It is alleged a 17-year-old male - who had attended the party - assaulted a 19-year-old man at nearby Gymea Railway Station, where police were patrolling to ensure that party attendants were travelling safely home.
The 17-year-old male was arrested, and charged with assault and resisting arrest.
During his arrest, a police officer was knocked to the ground, and hit his head on the concrete. He was taken to St George Hospital but was released overnight.
Police urge anyone with information about the party to call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page.