The police are looking for the man (pictured above) to assist with investigations in a case of outrage of modesty.
The incident occurred inside an MRT train from Braddell station towards Novena station on Monday at about 7.50am.
He is about 1.7m tall and was last seen wearing a red-and-white striped polo T-shirt and light blue jeans. He was also seen carrying a yellow paper bag.
Anyone with information should call the police at 1800-255-0000, or submit the information at https://app.spf.gov.sg/CrimeStopper/CrimeStopper.aspx. All information will be kept strictly confidential.