Though the origin of the catastrophic Eaton Fire has not yet been determined, the lawsuit faults the electric utility for failing to de-energize wires despite a red flag wind warning,

The latest red flag warning includes the Inland Empire and Orange County, as well as the already ravaged Los Angeles area.

Firefighters were slowly making progress in their battle to contain the inferno that has razed swathes of Los Angeles' Pacific Palisades neighborhood to the ground, but still-spreading flames threatened communities in the populous San Fernando Valley on Sunday.

Fire Agencies to Investigate Potential Edison Link to LA Hurst Fire (Reuters) - Fire agencies are investigating whether Southern California ... in Sylmar in the San Fernando Valley northwest ...

Gusts of up to 70 mph are possible along the coast and valleys, and in the mountains, up to 100 mph, the National Weather Service said. Parts of L.A. County, and most of Ventura County, are at highest risk.

The most serious red flag fire weather warning has been issued by the NWS for swaths of L.A. and Ventura counties starting before dawn Tuesday.

Southern California Edison said fire agencies are investigating whether electrical equipment was involved in the ignition of the Hurst Fire.

The investigation is critical for not only understanding what happened, but for ensuring it never happens again, said an attorney for 300 Altadena residents.

A judge on Tuesday approved a temporary restraining order for Southern California Edison to preserve data and equipment related to the area where the Eaton fire started.

Letters include how we need to be out from under the thumb of a utility whose first priority is to its bottom line; and Simi must clean up dry vegetation areas.

Despite dangerous wind conditions, fire crews made quick work of a brush fire near the Griffith Observatory. The extreme winds are posing another serious threat of wildfires across Southern California.

As Santa Ana winds returned to Southern California, residents and first responders braced for another day of critical fire weather.