The rape happened in the vicinity of Londonderry Park on the Portaferry Road in Newtownards early this morning, Sunday, September 15.
At around 6.25am the female reported that she had been assaulted by a number of males in the vicinity of the Park a short time earlier.
A 28 year old male has been arrested on suspicion of rape and remains in police custody at this time.
Detective Sergeant Lennon is appealing to anyone who was in the vicinity of Londonderry Park or Portaferry Road early this morning and who witnessed this incident or anyone who has information that could assist Police with their enquiries to contact detectives in Newtownards on 101, quoting reference 554 15/09/19.
Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111, which is 100% anonymous and gives people the power to speak up and stop crime.