Investigators have been told a group of about 30 teenagers were socialising together in the park when they were approached by a group of 6-7 males about 9.30pm.

The group of 6-7 males were about 15-18 years old and perceived to be Islander in appearance.

They approached a number of the teens in the park and assaulted and robbed a 17-year-old boy.

The group left the park on foot about 11.45pm.

Police are keen to speak to anyone who witnessed the incident to contact Crime Stoppers on 1800 333 000 or submit a confidential report at www.crimestoppersvic.com.au.