Fire guts vacant Perth house during party

A vacant Perth house has been destroyed by a fire started during a large party that was illegally held by people with no rights to the property, police say.

The incident on Saturday night comes two days after WA police charged four people who organised and collected entrance fees at two recent large parties that 1000 people attended at other vacant houses without the owners' permission.

One event resulted in officers being assaulted.

Firefighters were unable to save the vacant house in Crossandra Way, Greenwood that was set on fire.

Neighbours contacted police to complain about a large party and the property was ablaze and youths were fleeing when they arrived shortly before 10pm.

Arson squad detectives are investigating.