Detectives are looking for a man who inappropriately touched a teenage girl on a London Overground train last month.
The girl was travelling on a train from Dalston Kingsland in the direction of Stratford when the incident occurred on October 13th.
The man touched her through her clothes before she fled the train at Hackney Wick, the station after Homerton.
It took place at around 6pm.
If you have ANY information or saw anything suspicious, please phone police on 0800 40 50 40 or Crimestoppers anonymously on 0800 555 111.