Witnesses are being sought after a woman was sexually assaulted as she walked her dog in a green area off Kingsway in Wellingborough.
The incident happened between 10am and 10.10am on Friday, May 6, when a woman in her 30s was approached by a man who grabbed her arm, pulled her towards him and repeatedly asked for a kiss.
The offender is described as white with a light tan complexion in his late 20s to early 30s, about 5ft 2in, of an average build with dark brown hair styled to the side. He was wearing blue jeans and a dark coloured long sleeve top with a large logo on the front.
A couple came to the aid of the woman and officers would like to speak to them as a matter of urgency, or anyone who witnessed what happened.
Anyone who may have any information which could assist with the investigation is asked to call Northamptonshire Police on 101 or Crimestoppers anonymously on 0800 555 111.