Photo: vicpolicenews

Investigators have been told a 17-year-old Point Cook girl was walking home from school about 5.30pm on 28 February.

Whilst walking on Spinifex Street, she was approached from behind by an unknown boy on a bicycle who sexually assaulted her before riding off.

Detectives have released CCTV images of a male on a bicycle who they believe may be able to assist with their enquiries.

The boy is perceived to be aged in his mid-teens, and was wearing khaki shorts, a blue hooded jumper and Converse shoes.

Anyone who is able to identify the boy or with any other information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report online at www.crimestoppersvic.com.au.