British Transport Police (BTP) detectives are appealing for information after a man exposed himself and performed an indecent act in front of two schoolgirls.
Investigators have released CCTV images of a man they would like to speak to in connection with the incident which took place between 1.30pm and 2pm on Saturday, September 8.
Detective Constable Tony Bronger, the investigating officer, is asking for anyone with information to come forward.
He said: ““The two 14-year-old girls who boarded the train at Gatwick Airport, noticed a man get on at Worthing station and take a seat across the aisle to them.
“A short while later they realised that the man was exposing himself and performing an indecent act whilst looking at them.
“We believe the man left the train at Emsworth station.”
Officers have carried out a number of enquiries in order to establish the identity of the man, including speaking to witnesses and circulating images on police intelligence systems, but to no avail.
“We have now isolated an image and are looking for anyone who may recognise the man pictured to come forward,” continued DC Bronger.
“The incident took place on a busy train service so we believe witnesses may have information that could help our investigation.
“The man’s actions were completely unacceptable and understandably the incident left the victims upset and distressed.
“If you have any information about the incident, however small, we would really like to speak to you.”
Anyone with information should contact BTP on Freefone 0800 40 50 40 quoting reference B5/LS of 18/10/2012 Information can also be passed anonymously to the independent charity Crimestoppers on 0800 555 111.