Police are appealing for help after a man approached two girls on a Sydney train and allegedly performed a sex act.

Investigators released an image tonight of a man they want to speak to about the January 12 incident.

The two 15-year-olds were travelling on the top carriage of a T4 line train from Bondi Junction to Central Station when they were approached about 2.45pm, police were told.

Police are appealing for assistance from the public regarding an alleged sexual act on a train on the T4 train line o. Sunday, January 12, 2025 (NSW Police Force)

Police said the man “performed a sexual act in the presence of the girls” and left the train at Central.

Tonight they released an image of a man “who might be able to assist with inquiries”.

They described him as being about 30 years old with a large build and olive skin, wearing a black and white hat, basketball-style jacket and purple shorts.

The jacket was open exposing his stomach, police said.

Anyone with information can contact Crime Stoppers on 1800 333 000.

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