Police are calling for information in relation to a pedestrian strike that occurred in Katherine overnight.

Around 10:20pm, the Joint Emergency Services Communication Centre received reports of an unconscious male located on Riverbank Road.

Initial investigations indicate that the 20-year-old pedestrian was on the road at the time he was struck by a vehicle.

Police and St John Ambulance attended the scene, and the pedestrian was conveyed to Katherine Hospital suffering a serious head wound and was later transported to Royal Darwin Hospital for treatment.

The 50-year-old male driver did not initially stop at the scene; however, he contacted police a short time later and is assisting police with their enquiries.

The driver returned negative results for drug and alcohol testing.

Police urge anyone with information or dash-cam footage of the incident to make contact on 131 444 quoting reference number P25222262. Anonymous reports can be made through crime Stoppers on 1800 333 000 or via https://crimestoppersnt.com.au/.