Hawaiian Electric Industries Inc.’s stock plunged by a record on concern that its power lines may be linked to the deadly Maui wildfires.

Shares fell $10.94, or 34%, to close at $21.46 today on Wall Street, after earlier tumbling as much as 42%.

Hawaiian Electric, which operates the utility that serves Maui, has come under criticism for not turning off power despite weather forecasters’ warnings that dry, gusty winds could create critical fire conditions.

Plaintiffs attorneys are homing in on the utility’s equipment as a possible source of ignition and plan to file lawsuits this week.

Officials say they haven’t determined what triggered the blazes and Hawaiian Electric said it doesn’t have information on the possible cause.

Hawaii Attorney General Anne Lopez said Friday that she was opening an investigation into how authorities responded to the wildfires, which killed at least 96 people, a tally that is expected to rise.

Hawaiian Electric is working “to safely restore electricity, assess damage, remove debris and support our families, neighbors and employees,” a spokesperson said in an emailed statement. “At this early stage the causes haven’t been determined. We will work closely with the state and county as they conduct their review.”

“Fingers are being pointed at the utility,” Wells Fargo analyst Jonathan Reeder said Sunday in a note to clients, lowering his price target for Hawaiian Electric. State law appears to revolve around a “reasonableness of care” standard when determining negligence, which is a lower burden for plaintiffs to prove in court than a gross negligence standard, Reeder said.

(The Honolulu Star-Advertiser reported today that two lawsuits have already been filed and more are expected.

(The two lawsuits were filed electronically in the state Judiciary system Saturday, three days after Lahaina was reduced to near total ruins. One complaint was filed in Oahu Circuit Court on behalf of Lahaina residents Monica and Rede Eder by three law firms — Honolulu- based Lippsmith LLP and two California firms, Foley Bezek Behle &Curtis LLP and Robertson & Associates LLP. The other case was filed in Maui Circuit Court on behalf of Maui resident Nova Burnes by Revere &Associates, Law Offices of Richard E. Wilson LLC and Law Office of Kyle Smith, all based on Oahu.)

Read more: Attorneys aim to make Hawaiian Electric pay for Maui disaster

The risk of power lines sparking wildfires has grown across parts of the US as climate change creates hotter and drier conditions.

California’s largest utility, PG&E Corp., was driven into bankruptcy in 2019 after its broken equipment sparked some of the worst wildfires in state history. Since then, power companies in California, Oregon and Nevada have decided to preemptively shut off power when high, dry winds could spark catastrophic fires.

(Jim Kelly, a Hawaiian Electric vice president and spokesperson, told the Star-Advertiser Sunday that the company doesn’t have a PSPS program and neither do most utilities.)

Attorneys with Watts Guerra, Singleton Schreiber, and Frantz Law Group said they have been collecting evidence, interviewing eyewitnesses and reviewing reports that indicate that damaged power infrastructure owned by Hawaiian Electric Industries Inc. created the spark for the flames.

“All evidence — videos, witness accounts, burn progression, and utility equipment remaining — points to Hawaiian Electric’s equipment being the ignition source of the fire that devastated Lahaina,” said Mikal Watts, a Puerto Rico-based plaintiffs lawyer at Watts Guerra who has won millions of dollars in settlements in other wildfire cases, including against California utility giant PG&E Corp.

Plaintiff lawyers often dispatch representatives of their offices to sign up clients in the wake of wildfire disasters.

Although California utilities like PG&E Corp. preemptively shut down power when dry winds elevate wildfire risks, it’s tricky to do the same in Maui because it’s a tourist area, said Mojtaba Sadegh, an associate professor of civil engineering at Boise State University.

“The de-electrification is not as easy as in remote areas of California, because they know, they understand, they have been living there and they probably even welcome that loss of electricity, versus a tourist that’s enjoying their vacation,” he said.

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Bloomberg News’ Eric Roston and Star-Advertiser staff contributed to this report.