A man indecently exposed himself to a woman as she was sat in her car at a Kettering retail park.
Police are appealing for witnesses to the incident which took place at the retail park in Northfield Road sometime between 11.10am and 11.20am last Sunday (March 5).
A police spokesman said the offender, who the victim believes to be homeless, stood in front of her car, staring at her, before pulling his trousers and pants down and exposing himself.
He then pulled his clothes back on and walked away.
He was white, about 6ft 2in, with a medium build, short brown hair and overgrown stubble on his face.
He wore a dark-coloured hat, a dark-coloured jacket and dark trousers that may have been held up by a piece of string or rope.
Anyone with information about the incident can call Northamptonshire Police on 101 or Crimestoppers on 0800 555111.