Dozens of youths smashed their way into an unsupervised party organised on Facebook in Melbourne's south-west, damaging the home as they broke windows and kicked in doors, police have said.

Officers arrived at the house on Drysdale Crescent in Point Cook about 11:30pm after receiving reports of youths gathering in the street.

They were forced to retreat when at least 50 youths "charged at them in a threatening manner", police said in a statement.

Police said the party invitation had been private on Facebook, and the violence was triggered when the host refused the group entry.

The youths kicked in the front and back doors and smashed windows to get inside, police said.

Police said the youths damaged other areas of the home once inside and scuffles broke out in the street.

There were also reports some of those involved had armed themselves with wooden garden stakes.

Three people were treated for injuries at the scene.

Hosts feeling 'sheepish', concerned about father's reaction

Superintendent Stuart Bateson said no arrests had been made.

"They were a young group of men that showed up. It was a party that was about 100 strong, the invitation was for a small group of friends, by about 11:20pm it had grown to 100," he said.

Police retreated at first after being threatened by the group. ( ABC News )

"When the police arrived there was a huge group outside the house, they backed off and monitored ... rather than go in, make arrests and inflame the situation.

"We called in some specialist units and formulated a plan to disperse the group."

He said the young hosts were feeling "pretty sheepish" and concerned about how their father would react.

"Even though the big crowd of people was intimidating for the owners of the house and the neighbours, it was only a very small group causing the damage," he said.

One neighbour said it was terrifying and he feared for his life.

"Just sitting inside with a cricket bat just to try to look after my wife, look after ourselves. It just got out of control," he said.

"It was just a massive riot. They just trashed the whole house. It was quite frightening."

They urged anyone with information to contact Crime Stoppers.