Investigators have ruled out arson as the cause of a huge Southern California wildfire that was 75 percent contained Sunday after burning through coastal mountains and threatening thousands of homes.
Continuing cool, moist air significantly reduced fire activity and helped firefighters build containment lines around the 44-square-mile fire at the western end of the Santa Monica Mountains.
Officials expected full containment late Monday.
Investigators said the cause of the fire was not considered suspicious. Instead, they believed it was started by a small, “undetermined roadside ignition of grass and debris” on the edge of U.S. 101 near Thousand Oaks, said Tom Piranio, a spokesman with the California Department of Forestry and Fire Protection.