Multiple people were injured after an implosion involving a vat of chemicals at a paper mill in Longview, Wash., on Tuesday morning, the Longview Fire Department said.
The injuries at the Nippon Dynawave Packaging Company, which makes wood pulp and paper board for packaging and cartons, occurred shortly before 7:30 a.m. local time, the department said. Authorities did not know how many people were injured, their conditions, or how many of those who were injured worked at the plant, about 45 miles northwest of Portland, Ore.
There was “no immediate threat to the public,” the Fire Department said in a statement.
The department initially described the episode as a “major chemical explosion,” but said in a subsequent statement that it the cause was an “implosion involving a vat of chemical treatment product” at the plant.
People with chemical burns and other injuries were taken to PeaceHealth St. John Medical Center in Longview and PeaceHealth Southwest Medical Center in Vancouver, Wash.
A person who answered the phone at the Nippon mill declined to comment.
The Fire Department told residents to stay away from the plant, which sits near the Columbia River. Fire crews were working with hazardous materials teams, the department said.
The initial emergency calls to the fire department referred to injuries and chemical burns, Battalion Chief Mike Gorsuch told KIRO Newsradio. He did not immediately reply to a phone message on Tuesday.
Experts said that a fire at the Nippon mill in July 2023 caused air quality readings to reach unhealthy levels in Portland. Several wood chip piles, each of which is about the size of a football field, caught fire, a company official said at the time.
The 2023 fire was ruled an accident, but its cause remained unknown, according to an official report by Cowlitz 2 Fire and Rescue cited by The Columbian newspaper.
Firefighters also fought a blaze at a locomotive repair shop on the Nippon property in 2025. No injuries were reported in the 2023 or 2025 fires.
Christine Hauser is a Times reporter who writes breaking news and features.
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