A 16-year-old girl was allegedly assaulted by a man in a blue running tracksuit in a Cleethorpes park.
Humberside Police are looking for the man in connection with the reported indecent assault on February 17.
The girl was walking through Cleethorpes Country Park towards Park Lane with her friend around 4pm, when she reported that she was approached by a man who touched her inappropriately. He then ran off.
Police said the teenager was shaken and upset but not injured.
The victim has described the man as white, aged between 40 and 60, tall (possibly between six feet and six feet five), and of skinny build.
He was said to be wearing a blue running tracksuit with a red badge on it and a cream beanie hat.
Anyone who recognised the man described or has any information in connection with the incident, is being asked to call Humberside Police on 101 quoting log 370 of February 17.