ROCKINGHAM Police are investigating a party at a commercial building in Rockingham on Saturday night.
The party was advertised on Facebook and it is estimated that between 200 and 250 people attended.
Police declared the party out of control just before 9pm and the crowd was dispersed.
During the incident, seven move-on notices were issued and seven children were taken to a safe place.
While police were completing their duties, an unattended police car received damage to its bonnet, passenger door and side mirror.
Police would like anyone with information about the organising of the party or the damage to the police vehicle to contact Crime Stoppers on 1800 333 000 or to make a report online.