Photo: vicpolicenews

Police have been told the party was organised at an abandoned building on Fogarty Avenue about 2am.

It is believed a number of party-goers were assaulted by five unknown offenders who also stole wallets, mobile phones, bags and passports.

The offenders are described as male and female aged in their 20s and were wearing dark clothing.

Detectives have released digital images of a man and a woman that may be able to assist with their enquiries.

Police are appealing for anyone who witnessed any suspicious behaviour in the area at the time to come forward.

Anyone who recognises the pair is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report online at www.crimstoppersvic.com.au.