A woman was sexually assaulted on a train in front of numerous other passengers. The onlookers did not get involved as they thought the two people were a couple.
The train was travelling from London Bridge to Chislehurst between 12.53am and 1.15am on Friday, July 18.
The victim was followed onto the train by a man who sat next to her. He then assaulted her for around 20 minutes before leaving.
Police are looking for the pictured as part of their investigation.