It took police, an overhead helicopter and the riot squad more than an hour to disperse the crowd.
A 16-year-old girl's birthday party in Sydney's south has gone horribly wrong after 500 teenagers turned up uninvited.
The Sweet 16 on Bounty Avenue in Kirrawee quickly spiralled out of control last night.
A video later circulating on social media shows a tense confrontation between police and some of the young people involved after the crowd turned hostile.
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A boy, 16, was arrested at the scene after allegedly throwing a full can of alcohol at officers.
In a statement defending their actions, police said "when bottles were thrown at police, OC spray was deployed" and that during the arrest "the boy resisted officers".
He was one of three teenage boys arrested.
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All of them were later released without charge.
Neighbours said they were left shaken by what unfolded and many young children watched the chaos unfold on their doorsteps.
"There were a few people climbing over their neighbours fence here to get in and out of the party," neighbour Aedan Byrne told 9News.
It took police, an overhead helicopter and the riot squad more than an hour to disperse the crowd.
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