Pacific Gas and Electric Company said that it is cooperating fully with an investigation by the California Department of Forestry and Fire Protection into the source of ignition for the Butte Fire. In a CAL FIRE incident briefing in Angels Camp, California, Barry Anderson, PG&E vice president of emergency preparedness and operations, said: "While we don't have all the facts yet, a live tree may have contacted a PG&E line in the vicinity of the ignition point.