LONGVIEW, Wash. (AP) — Crews were set to resume searching for nine workers at a Washington paper mill where a tank imploded, releasing a highly destructive chemical mixture called “white liquor” and causing at least one confirmed death.

Authorities said there was no hope of finding more survivors of Tuesday's tank implosion at Nippon Dynawave Packaging Co. in Longview, which also injured nine other people, including a responding firefighter. But before any bodies of the missing can be recovered, crews on Wednesday must first stabilize the tank, which was at risk of collapsing further and leaking more of the caustic liquid.

The implosion caused the huge circular tank to buckle and collapse on one side, and officials said they would only work during daylight because of the dangers. While the cause remains unknown, authorities said there was no threat to the community, a Columbia River city of about 40,000 people with long ties to the Washington and Oregon paper and lumber industries.

It was the second notable chemical tank failure in days on the West Coast, following the evacuation of thousands of Southern California residents due to a damaged tank at an aerospace plant before those orders were lifted Tuesday night.

The paper mill tank was holding about 900,000 gallons of a liquid made of mostly sodium hydroxide and sodium sulfide. Known as white liquor, it is used with heat to break down wood to make kraft paper, a durable material used in packaging, shopping bags and other products.

The sprawling plant, which employs about 1,000 people, makes material for tissues, printing paper, cups, plates, and cartons. It sits along the river next to other timber, paper and chemical businesses.

At a community vigil Tuesday night, dozens gathered to pray, light candles and embrace loved ones.

Crystal Moldenhauer, a Longview resident, said she has friends at the plant who remained unaccounted for. She said people called and texted each other all day trying to figure out what happened.

“We’re all still waiting for answers,” she said. “There’s families that have been torn apart, and we don’t know why.”

The cause of the implosion remained unclear.

Scott Goldstein, a fire chief with Cowlitz County, said Tuesday night that the tank still held about 90,000 gallons (more than 340,000 liters) of the volatile liquid.

“We don’t know until we know, hopefully tomorrow, how we can stabilize the tank. Do we remove the product first? Do we stabilize the tank first or the vice versa?” Goldstein said.

Hours after the disaster, officials repeatedly referred to the situation as a recovery effort.

Some of those who were injured suffered burns or inhalation injuries, authorities said.

Following the tank's rupture, the liquid spilled into a drainage ditch, said Brittny Goodsell, a state Ecology Department spokesperson.

“I know there’s a lot of questions about how all of this happened and I want to assure you that we will all continue to pressure to get answers to those questions,” Murray said.

Safety complaints were filed against Nippon Dynawave in March and May. The state’s labor and industries department said on X that both were unrelated to the current situation. One was an anonymous complaint about a valve on a tank, according to the department, which noted that it was not the tank that imploded.

Nippon Dynawave, a subsidiary of Japan-based Nippon Paper Group, has been fined $3,400 for three separate health and safety violations found by Washington Department of Labor and Industries inspectors since the start of 2021, according to the department’s online database.

Just over 40 people died between January 2021 and mid-October 2023 as a result of hazardous chemical incidents in the U.S., according to a paper released by a network of environmental justice organizations in late 2023.

Southern California officials lift all evacuation orders for residents near damaged chemical tank

GARDEN GROVE, Calif. (AP) — Southern California officials lifted the final evacuation orders Tuesday night for residents who live near a damaged chemical tank, allowing 16,000 people to return home.

The crisis that began Thursday had forced 50,000 people to evacuate in and around the Orange County city of Garden Grove. A crack that formed by chance on the tank relieved pressure and helped avert a catastrophic explosion, allowing most evacuees to return home over the Memorial Day weekend. Authorities announced they were lifting the final orders after the temperature on the tank remained stable for four hours without intervention from sprinklers.

“All residents will go home,” Orange County Fire Authority Division Chief Craig Covey said during a meeting that grew raucous at times as residents questioned why the chemical was allowed in a densely populated area and urged city officials to hold the company that operates the tank accountable.

The tank contains methyl methacrylate, which is highly flammable. Health officials have assured residents that no contamination or fumes were released, and that they will keep monitoring the air for several months and checking the sewer and storm drains. Exposure to the chemical can cause serious respiratory problems, neurological issues and irritation to the skin, eyes and throat, according to the federal Environmental Protection Agency.

The tank at GKN Aerospace Transparency Systems, which makes cockpit windows, canopies and windshields, contains 6,000 to 7,000 gallons (22,700 to 26,500 liters) of the chemical.

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Boone reported from Boise, Idaho. Associated Press reporters Gene Johnson and Hallie Golden in Seattle and Christopher L. Keller in Albuquerque, New Mexico, contributed.