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A woman reported being sexually assaulted while walking her dog in Darlington.
Durham Police said the woman was walking near Blackwell Lane around 7.30am on Friday (September 25) when the incident happened.
She reported to police that a white man approached her, made derogatory comments and touched her inappropriately.
The man is described as tall, of slim build with dark facial hair and was wearing black joggers and a green hoodie at the time of the attack.
A spokesperson for Durham police said: "An investigation is ongoing and detectives are keen to hear from anyone with any information."
Anyone with information about the incident is asked to call Durham police and quote incident reference 78 of September 25.