A man exposed himself to shoppers at Westgate Retail Park.
The incident happened between 2pm and 2.10pm on Sunday, at the retail park on Colinsway.
Police said the man was in his mid 20s, skinny and 6ft tall.
He was scruffily dressed and wearing a multi-coloured beanie hat.
Officers from the Central neighbourhood police team are increasing patrols in the area.
Anyone with any informations should contact police on 101.