A woman was sexually assaulted last month in Hemel town centre during the early hours of the morning.
The offence happened between 2am and 4.30am on March 28 when the victim, a woman in her 20s, was walking along Marlowes near to Hillfield Road when she was approached by a man who sexually assaulted her.
The suspect is described as a Russian man in his late teens to early 20s.
Detective Sergeant Dave Taylor, from the Herts Police major crime unit is leading the investigation. He said: “Understandably the victim has been left traumatised by what happened and is being supported specially trained officers.
“We believed that the man pictured may have information that could help in our investigations. If you are this person or you recognise him please contact the Herts Police non- emergency number 101 quoting crime reference D1/16/2245.”