Investigators are trying to figure out what sparked flames inside a barn in Napa County.
The fire erupted about 8 p.m. Tuesday on Old Sonoma Road west of Highway 29.
Firefighters say the 4,000-square-foot bar was used to store and fix all-terrain vehicles, tractors and forklifts. At least nine vehicles were torched. No one was hurt and the fire did not spread to the nearby vineyard.