An investigation is underway after a woman was sexually touched by a man impersonating a police officer in the state's north.

About 8.50pm on Sunday 10 December 2023, a woman was driving along Tumbulgum Road, Murwillumbah, when a white sedan with a blue flashing light started following her.

The woman, under the impression that the driver of the car was a police officer, pulled over and the driver of the sedan approached the woman.

Police have been told that the woman was sexually touched after she was directed by the man to leave her vehicle.

The man left the scene a short time later in the white sedan, and the incident was reported to officers from Tweed/Byron Police District.

As inquiries continue, police have released the description of a man they believe can assist with the investigation.

The man is described as being of Caucasian appearance, aged 35 to 45, of medium build, with stubble and dark hair described as being short on the sides and longer on top.

At the time of the incident the man was wearing a light blue button-up shirt, with a navy-blue zip-up water-resistant jacket, dark pants and blue gloves.

Police believe several cars drove past during the course of the incident, and urge those who may have seen anything to come forward.

Police wish to remind the community that they can request to see official identification, such as a NSW Police Force badge or photo identification card, when stopped by police.

Anyone with concerns about being stopped can contact their nearest police station to verify their identity, but if concerned, contact Triple Zero (000).

Anyone with information about this incident is urged to contact Crime Stoppers: 1800 333 000 or https://nsw.crimestoppers.com.au. Information is treated in strict confidence.

The public is reminded not to report information via NSW Police social media pages.