Police officers want to trace a man over reports that women were photographed in a supermarket in Dronfield.
Officers have issued CCTV images of a man they believe could hold vital information about the incident.
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They are following up reports that a man used a mobile phone to take photographs of women in Aldi's store on Sheffield Road.
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A Derbyshire Police spokesman said: "We are appealing for information to help identify a male we would like to speak to regarding suspicious behaviour in Aldi, Sheffield Road on Thursday, May 17.
"Male appears to be taking photos of a number of women before exiting the store when disturbed by a member of the public."
Anyone with information should call South Yorkshire Police on 101 quoting incident 737-170518.