Party hosts in police sights in Perth

Perth revellers have been issued a warning ahead of the festive season after police had to deal with allegedly out-of-control parties on the weekend.

Police video appeared to show vandalism and violence taking place in the city last weekend.

"I've just never experienced anything like it in my life, it was just out of control," one witness said.

One gathering at the North Perth Town Hall claimed it booked space for an art exhibition, but the riot squad was called in when things grew ugly.

Police also broke up a 16th birthday party last night after multiple complaints.

Ahead of the Christmas season, police have warned that party hosts or their parents can be held liable for the actions of their guests – including gatecrashers.

That includes any injuries, property damage or excessive alcohol consumption.

Police have the power to issue move-on notices and to charge those who refuse.

A party host charged with organising an out-of-control gathering could face fines of up to $12,000 and could also be billed for the cost of the police call-out.