A man performed a public sexual act while lying on a bench on the canal footpath at Pacey’s Bridge just off Park End Street at around 3.45pm on Wednesday (September 18).
He is described as Asian, with black hair, in his late 20s or early 30s.
He was wearing a dark suit with a pale colored shirt and black shoes and was theat the moment on a black bag.
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Investigating officer PC Tobias Loughran said: “This is a worrying incident and we are carrying out a thorough investigation and have increased patrols in the area.
“I am therefore appealing to anyone who witnessed or filmed this incident to please come forward.
“Also, if anyone was driving in that area and has dash cam footage, please get in touch.”
Anyone with information can call 101 or report online, quoting reference 43240449653.