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.

Los Angeles County is suing Southern California Edison over the Eaton Fire, which killed 17 people in January. The big picture: The cause of the blaze that was one of California's most destructive wildfires on record remains under investigation,

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.