The County of Los Angeles and city of Pasadena filed separate lawsuits against Southern California Edison Wednesday over the deadly Eaton Fire, alleging the utility's electrical equipment caused the wildfire.

Fire investigators have not found Edison responsible for the Eaton Fire — but mounting lawsuits heighten concerns about its potential liability for the deadliest and most destructive blaze since the state created a fund to prevent wildfires from bankrupting utilities.

The county says electrical equipment owned by the electric utility is to blame for the blaze that killed 17 people and destroyed 9,400 buildings.