A woman was assaulted by a man in Anagh Coar in the early hours of Sunday morning.
She was walking along the top of Annacur Lane at around 3am when she was attacked.
The man is described as about 5'4" tall, of slim build, with dark brown hair which was shorter on the sides, longer and ruffled on top.
He had a long, thin face and very short stubble.
He was wearing a plain, navy blue zip-up hoodie, navy blue or black jeans and white, Converse-style trainers.
Officers say if you have any information about the man, or were a witness to the attack, call police on 631212 or Crimestoppers on 0800 555 111.