THE Listen Out Festival at Arena Joondalup on Sunday turned sour when hundreds of gatecrashers tried to storm the fences.
Security guards were outnumbered with people pushing over fences, climbing roofs and trying to break in to the building.
“The event’s security managed the situation with few successful breaches but as the number of people attempting unlawful entry kept rising, police were asked to provide additional assistance,” VenuesWest acting chief executive Janis Carren said.
“Police and event security then contained and managed the situation.”
Police Media spokesman Sergeant Andrew Maher said security requested police help about 3.20pm with people “throwing rocks at patrons and pushing on external fencing”.
“While police were moving on the large group, consisting of about 300 people, they began throwing objects at police,” he said.
During the incident, three police officers were assaulted.
Sgt Maher said police dogs and horses helped officers to move the groups on. Fifteen move-on notices were issued. Riot police also attended.
Arrests included a 23-year-old man from Roleystone who was charged with disorderly behaviour, a 22-year-old man from Armadale and a 20-year-old woman from Kalamunda charged with assaulting a public officer and a 22-year-old woman from Kalamunda charged with assaulting a public officer and obstructing police.
Police have viewed CCTV of the incident and investigations are continuing.
The charged people will appear in the Joondalup Magistrates Court at later dates.
Listen Out Festival was a sold-out dance music event for over-18s.