About 2.30pm, what was believed to be a rock hit a silver Toyota Landcruiser being driven north on the Princes Highway approaching the Nowra Bridge.

The front windscreen of the vehicle was cracked in several places, however the 18-year-old male driver and his female passenger were not injured.

They told police they saw two youths, one wearing a blue hooded jumper and one wearing a black hooded jumper, running from the underpass of the bridge, toward a nearby caravan park.

As police continue their inquiries, they are urging any witnesses or anyone with information to come forward and contact them via Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page: https://nsw.crimestoppers.com.au/ Information you provide will be treated in the strictest of confidence.