Firefighters are battling a blaze which has erupted in Moorhouse Park, Nowra, on the southern bank of the Shoalhaven River behind the old Riverhaven Motel.
Several Fire & Rescue appliances are on the scene, as well as a number of police vehicles.
There is a significant amount of smoke in the area and it appears a structure at the rear of the derelict motel has caught fire.
Police responded to reports of the fire at about 7am. They will conduct a full investigation and prepare a report for the coroner.
Superintendent Greg Moore encouraged anyone with information to contact Nowra police on 4421 9699 or Crime Stoppers on 1800 333 000 The fire danger rating for the Shoalhaven today is severe. Vigorous westerly winds are predicted.
A Total Fire Ban is in force for Friday, November 15.