"This sort of thing ties up police for extended periods so it's not possible to attend other incidents or provide support to other people in the community. This tied police up for more than an hour."
Mr Grimes said people planning parties could follow steps to ensure their parties were safe.
According to Bay of Plenty police some areas in New Zealand, including Rotorua, have introduced party registers. They also recommend having plans in place if things start to get out of control and making sure there is food and non-alcoholic drinks available.
Registration means that police are aware of the party and have a record of who to speak to; making it easier for them to help sort any issues that arise. Anyone who registers also receives a helpful pack with useful tips and tactics.
Party advice:
* Register your party at www.partyregister.co.nz
* Ensure there is adult supervision and a plan in place in the event of gatecrashers or disorder
* Be a responsible host and provide plenty of snacks, food and non-alcoholic drinks
* Arrange for friends to stay over or have a means of getting home safely
* Be a good neighbour and let your neighbours know of your party intentions
* If trouble is brewing or it's starting to get out of hand, call the police before it escalates
* Keep an eye on your guests, especially those who are drinking
- Supplied by Bay of Plenty police