Police officers were called to a Sheffield park after a man was spotted exposing himself and committing a lewd act.
Members of the public reported the incident in Graves Park, Norton, at 2.20pm last Thursday afternoon.
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They spotted the man exposing himself and committing a lewd act close to the Hemsworth Road entrance.
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South Yorkshire Police said officers searched the area and checked CCTV cameras but the culprit was not identified.
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He was white, around 5ft 8ins tall, slim and had dark hair.
Anyone with information should call South Yorkshire Police on 101 and quote incident 478 of August 9.