PORTLAND (AP) — Additional plaintiffs in Oregon have joined a $600 million lawsuit against power utilities, alleging that the companies let electrical equipment spark wildfires that ravaged the state in September.

Three of the region’s law firms that are behind the class action lawsuit announced an amended complaint on Monday that includes more people who said they were impacted by the wildfires.

The law firms said PacifiCorp and Pacific Power were negligent in properly maintaining their electrical infrastructure, which caused deadly wildfires after a windstorm on Labor Day weekend.

The revised lawsuit includes more details from specific plaintiffs about the hardships the wildfires caused them. Some plaintiffs also claim in the amended lawsuit that they saw electrical equipment start fires, KATU-TV reported.

PacifiCorp and Pacific Power told KATU-TV that they don’t comment on pending litigation.