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Police investigating reports that a man indecently exposed himself to a female runner in Cottingham have released a CCTV image of a man they would like to speak to.
Officers said the woman was followed prior to the incident at about 20:00 BST on Sunday.
The perpetrator is also said to have performed a sex act before fleeing the scene.
A Humberside Police spokesperson said the man, pictured, could help officers' inquiries.
The BBC has contacted the force for an exact location of the incident.
Hull and East Yorkshire on BBC Soundslatest episode of Look North here.