The incident is alleged to have happened between 1am and 3am on Sunday 12 November 2023, at a car park in Corporation Street which is next to a car wash and opposite the train station.
Officers are continuing to pursue several enquires and an investigation is being led by the Kent and Essex Serious Crime Directorate. Anyone with information which may assist the investigation is urged to come forward, including people who may have attended the nearby City Wall wine bar.
Motorists with dashcam who may have been in the area, as well as residents with doorbell cameras or CCTV, are also asked to check for any important footage.
If you have any information call Kent Police on 01622 604100, quoting reference 46/200907/23. You can also contact Crimestoppers anonymously on 0800 555111 or by using their online form.