Police said initial investigations indicated a man entered a Dale Street home and approached two young girls around 7.45pm on Sunday.
The Courier Mail reported that the man entered the house through an open door during the 15 minutes the mother was out of the home returning a car after spending the day at the beach.
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There were five daughters and a baby boy in the house at the time.
Police say the man attempted to remove the clothing from one girl before indecently assaulting a second girl in the room.
It’s believed the man then fled the house through a back door. Police said neither girl was physically injured.
Police are looking for a man described as Caucasian, around 165cms tall with fair skin and in his early 20s with dark hair.
Investigations are continuing, and police are urging anyone who may have information which may assist them to contact Crime Stoppers on 1800 333 000.