The victim was ‘seriously assaulted’ between 8.30am and 9.30am on Friday, March 21 in the town’s Whitecrook Street.
The 27-year-old had to be taken to hospital for treatment.
Her condition is not known.
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Police are now appealing for anyone with information about the incident to come forward.
They said a description of the attacker is “unknown”.
Detective Constable Darren Boag said: “Our enquiries into this assault are ongoing and I would appeal to anyone who may have information regarding it to contact us.
“If you were in the area around the time or have any CCTV, ring doorbell or dash-cam footage that could assist with our investigation then please provide this to us.”
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Anyone with information is asked to contact police via 101, quoting incident number 0661 on March 21.
Alternatively, Crimestoppers can be contacted anonymously on 0800 555 111.
