A man wearing dark clothing and a baseball cap indecently exposed himself on Overstrand Road, Cromer.
The incident happened between 9.45pm and 10.05pm on Thursday December 2 near Cliff Drive.
Police say the man carried out an inappropriate sexual act before crossing the road and walking towards the town centre.
Anyone who saw acting suspiciously in the area at the time should contact PC Glen Taylor at Cromer police station on 0845 456 4567 or anonymously by calling Crimestoppers on 0800 555 111.
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