A 15-year-old girl has been charged after her birthday party sparked a riot involving 200 youths carrying knives and throwing bottles at police.
Police were asked to attended a house in Queens Park just before 9pm (WST) on Saturday after reports of a mob fighting with knives at the front of the house.
Those allegedly fighting evaded police by running to the back of the property.
Numerous vehicles parked in the street had their windows smashed, and dozens of police were called.
The birthday party, which had about 200 guests, was declared an out-of-control gathering.
But police had to withdraw as bottles rained down on them. Mounted police and the dog squad were used to help remove the unruly revellers.
WA police say detectives have now charged a 33-year-old Queens Park woman with being a responsible adult of a child who organised a gathering that became an out-of-control gathering, and she will appear in court at a later date.
A 15-year-old Queens Park girl has also been charged with organising a gathering that became an out-of-control gathering, and will also appear in court at a later date.
