Cal fire released their report:
"The Chariot Fire began just before 1 p.m. July 6 near Butterfield Ranch Resort and the Great Southern Overland Stage Route on land managed by the BLM, according to Cal Fire. The blaze, which burned out of control for 10 days, destroyed 149 buildings and blackened 7,055 acres. More than 2,100 firefighters from around the state eventually stopped the fire from spreading."
Investigators have identified the BLM agent who was driving the Jeep Cherokee that started the fire, but he has refused to answer questions on the advice of his attorney, UT San Diego reported. The BLM completed its own investigation, but the agency has refused release it, the newspaper said.
Found on http://fox5sandiego.com/2014/05/09/chariot-fire-sparked-by-blm-jeep-cal-fire-says/#axzz31GCKmM00
Keep in mind that tall, dry, dead weeds can catch on fire and burn from contact with a catalytic converter... which is really hot. In 1995, in San Diego, during the NAS Miramar airshow, a police cruiser wsa parked and running on the side of a road to watch the airplane show, and started a wild fire