Fatalities and critical injuries were reported after a chemical tank ruptured at a paper mill in Longview, Washington, on the morning of May 26, the Longview Fire Department said.
The rupture at Nippon Dynawave Packaging, which makes wood pulp and paper board for packaging and cartons, occurred shortly before 7.30am local time, the department said.
The authorities did not say how many people had been killed or injured, or how many of those people worked at the plant, which is about 72km north-west of Portland, Oregon.
There was “no immediate threat to the public,” the Fire Department said in a statement.
In a joint statement, Nippon and emergency authorities in Longview said a tank containing chemicals ruptured, causing “multiple critical injuries.”
“Officials can also confirm fatalities related to the incident,” the statement said.
The tank contained “white liquor,” it said, referring to a solution of sodium sulfide and sodium hydroxide that is used to make pulp out of wood chips, in a process that also involves high pressure and temperatures.
The fire department initially described the episode as a “major chemical explosion” but said in a subsequent statement that 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, Washington.
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 May 26.
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. NYTIMES
