Police want to trace a man who inappropriately touched a woman on board a train travelling through Sheffield.
British Transport Police have issued an appeal for witnesses following the incident onboard a train travelling to Norwich.
The incident occurred at about 3.30pm on the East Midlands Train Service, from Liverpool Lime Street to Norwich.
The victim left her seat and was waiting for the trolley service to pass when she was touched inappropriately by a man.
The man was travelling with a group of men who later got off the train in Sheffield.
Investigating officer PC Emma Williamson said: “On reaching the vestibule, the victim stood to one side to allow the trolley service to pass.
“Behind her was a group of six to seven men, some seated and some standing.
“One of the group touched the victim’s bottom.
“She turned around to confront the offender but was unable to identify which of the group it was.
“When she was groped for a second time she challenged the member of the group she believed was responsible, who then apologised.
“The group left the train at Sheffield.
PC Williamson said behaviour such as this in completely unacceptable.
She added: “The victim was left feeling angry by what had happened and we are keen to speak to anyone who may have witnessed the incident. Behaviour like this is completely unacceptable and will not be tolerated.”
Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or text 61016, quoting reference PSUB/B4 of 10/04/2015. Alternatively, call Crimestoppers anonymously on 0800 555 111.