Officials said Thursday that a wildfire in rural Northern California's Napa County that has damaged two homes and forced the evacuation of 200 others grew overnight, as crews struggled to tame the flames in the steep terrain. The fire had burned more than 17 square kilometers as of early Thursday and had grown 202 hectares from the previous day. It remains 30 percent contained. California fire spokeswoman Alicia Amaro said that the fire made short runs uphill during the night. The steep and rugged terrain has forced crews to build containment lines by hand without the help of bulldozers. The fire has damaged two homes and seven outbuildings.