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Police are hunting three men after teenage girls were allegedly targeted during a series of indecent assaults on Sydney public transport.

Officers attached to Police Transport Command have released CCTV footage and images of three men who they believe can assist with their inquiries into several alleged indecent assaults.

They are asking for help from the public to identify the men.

About 6pm on Friday, August 17, 2018, a 19-year-old woman was allegedly indecently assaulted by a man on a train travelling to Auburn from St James Railway Station.

The man police believe can assist inquiries is described as being of Indian Sub-Continental appearance, about 165cm tall, aged in his late 20s or early 30s.

He was pictured with short dark hair and facial hair, wearing a grey hooded jacket, navy pants, bright blue shoes, and a navy backpack. The 19-year-old woman took a photograph of her alleged attacker.

The second incident occurred at 1.50pm on Sunday, March 3, 2019, when an 18-year-old woman was allegedly indecently assaulted by a man while on a bus travelling from Parramatta to Baulkham Hills.

The man police believe can assist inquiries was described as being of Indian Sub-Continental appearance, aged in his late 20s. He was pictured with short dark hair and facial hair, wearing a short-sleeve navy collared shirt, blue jeans, and grey shoes.

The third incident happened about 3.25pm on Thursday, May 30, 2019, when a 14-year-old girl was allegedly indecently assaulted by a man on a bus travelling from Blacktown to Glenwood.

The man police believe can assist inquiries is described as being of Middle Eastern/Mediterranean appearance, with a medium build. He is pictured with medium-length dark hair, wearing a beige collared jumper, and dark pants.

Commander of the Police Transport Command North West Sector, Detective Superintendent Brad Monk, said the efforts behind Operation Artemis will continue investigating and preventing crime on public transport.

Operation Artemis is an ongoing strategy by Police Transport Command to investigate and prevent assaults and acts of indecency on public transport.

“It’s unacceptable that people going about their day-to-day lives on public transport are subject to such cowardly acts,” Supt Monk said.

“Operation Artemis is as much about preventing crime on public transport before it happens, as it is about investigating. Our officers are constantly patrolling and watching the public transport system, and make no apologies for getting in the face of people they believe are committing crimes.

“We remind the public who have been subject to assault on public transport that any information you provide to police will be treated with the strictest of confidence, and our inquiries will be extensive,” Supt Monk said.

Know anything? Contact Crime Stoppers on 1800 333 000 or visit crimestoppers.com.au

andrew.koubaridis@news.com.au