Shares of electric utility company PG&E plunged 7.7 percent Friday on concerns its power lines may have started the massive wildfires that have ravaged California recently.

The stock was also on track for its worst day since September 2010.

The California Public Utilities Commission sent a letter on Thursday to PG&E — California’s largest electrical utility company — reminding them to preserve “all evidence with respect to the Northern California wildfires in Napa, Sonoma and Solano Counties,” according to multiple reports.

The commission was investigating whether electrical lines that were knocked down by a windstorm on Sunday played a role in sparking the most lethal wildfire event in the state’s history.

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