A vehicle fire at Hercules Enterprises, on Valley Road, at about 1:30 a.m. Monday burned as many as 20 vehicles stored at the business, police said. No injuries were reported.
The cause of the fire hasn't been determined, but is not under investigation as arson.
Hercules Enterprises manufactures trailers and tanker trailers for trucks, but the fire involved vehicles owned by Co-Part Salvage Auction, which leases space at Hercules to store vehicles, police said.
The fire burned for some time, causing officials to request additional firefighters, incuding Manville, Somerville, Raritan, Finderne and Millstone firefighters. Hillsborough and Somerville Rescue Squads also responded, as well as the Somerset County Hazmat and Department of Envirnomental Protection.