Police are hunting for an offender after a 15-year-old girl was sexually assaulted in a “vulgar” attack on a bus in Melbourne’s south-west last month.

According to police, the girl had boarded a bus at Hoppers Crossing railway station about 7.15pm on Sunday, September 11, when a man sat next to her and sexually assaulted her.

Detective Senior Constable Megan Fisher said the victim pushed the offender away from her and managed to flee, running home to her parents and calling police.

CCTV footage of a man police want to speak to in relation into an investigation about a sexual assault
Victoria Police has released these images of a man they want to speak to in relation to the investigation. (Victoria Police)

“It took her a lot of courage to be able to forcibly remove someone off of her and her to be brave enough to get the person away from her,” Fisher said.

“Nobody catches public transport and expects to be assaulted. It’s vulgar.”

Police have released two images of a man who they believe will be able to help with the investigation.

“The man is perceived to be Middle Eastern in appearance, approximately 18 to 25 years of age with short dark hair, thin moustache and thin build,” a statement from Victoria Police said.

Police have released two images of a man who they believe will be able to help with the investigation. (Nine)

“He was wearing a face mask and a dark-coloured zip-up jacket with a white t-shirt, light grey jeans, dark runners and carrying a black backpack and a plastic supermarket bag.”

Anyone with information about the incident has been urged to contact Crime Stoppers on 1800 333 000.

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