Vic party balcony collapse leaves two dead

A Christmas party at a Melbourne house turned to tragedy after a balcony collapsed, killing two women and leaving more than a dozen injured.

Up to 30 people were believed to be on the balcony at the Doncaster East house when it collapsed on Saturday night, trapping party-goers underneath.

A 59-year-old Croydon woman died at the scene while a Reservoir woman, 37, died in hospital on Sunday morning.

Neighbours were shocked at the horror accident and did what they could to help the injured.

"The crash was biblical, the sound of it was nothing I've heard before," Andrew Stone told reporters.

"People were bringing out chairs, and pillows and blankets and things like that just to help out the people who were injured," he said.

Alex Tan said it was a nice neighbourhood and the event was tragic.

The balcony collapse prompted a major emergency services response with police, firefighters and paramedics swarming to the "chaotic" scene.

"This is a very tragic incident for those involved and our thoughts are with them and their loved ones at this time," Ambulance Victoria's state health commander Paul Holman said.

The balcony collapsed during what is believed to be a Christmas party for Tupperware sales consultants.

Ten women and seven men, aged between 20 and 69, were taken to hospitals with soft tissue injuries, fractures and lacerations.

About a dozen people were treated by paramedics at the scene at Balinga Court but did not require hospitalisation.

Police are investigating the collapse and will prepare a report for the coroner.