It is alleged that around 21:30 a man was on the roof of a green car driving along the road between Clos Gosset and Georgetown.
Police are especially looking to speak with a taxi driver who may have seen this.
They would also like to speak to anyone else in the area that may have witnessed the alleged incident.
Anyone with any information is asked to contact police on 612612 or anonymously via Crimestoppers on 0800 555 111.