More than 40 lawsuits have been filed against Southern California Edison, as law firms launch their own investigations into the cause of the Eaton fire.

The utility has noted multiple irregularities, but maintains there is no evidence its equipment sparked the destructive Eaton fire.

Edison International’s utility is looking at whether a power line retired in 1971 started the Eaton wildfire as part of a probe into the cause of the blaze that razed more than 9,000 structures.

Southern California Edison disclosed that its equipment might have sparked the Hurst Fire, which erupted during January’s deadly LA firestorm, the Associated Press reports. The Hurst Fire burned 1.25 square miles but caused no fatalities or structural damage.

California utility company Southern California Edison on Thursday said its equipment “may be associated with” the ignition of the Hurst Fire, which burned alongside the Eaton and Palisades fires during January’s Los Angeles firestorms.

A California utility says its equipment likely sparked a small wildfire in Los Angeles that broke out the same day as two massive blazes in the area killed at least 29 people and destroyed thousands of homes.