A "major chemical explosion" at a facility in Washington state on May 26 left multiple injured, authorities said.The explosion happened at the Nippon Dynawave Packaging Company in Longview, Washington, about an hour north and over the state border from Portland, according to the Longview Fire Department. At about 7:18 a.m. local time, the department responded to "an implosion involving a vat of chemical treatment product."Multiple people suffered chemical burns and other injuries and were taken by ambulance to local hospitals, the fire department said. A total number of injured and the conditions of the victims was not released.The facility is a pulp and paper mill and a liquid packaging plant, according to the Washington Department of Ecology, which said it regulates the "air, water, and hazardous waste activities" there.There is no immediate threat to the public, the fire department said. Fire crews and a hazmat team were working with the facility's employees to mitigate the chemical treatment product and container involved.The pulp and paper mill has about 550 employees and makes "280,000 tons of bleached liquid packaging paperboard and wetlap and slush pulp each year," according to the Ecology Department. The liquid packaging plant has about 450 employees.The facility produces bleached paperboard that is used to make cartons and cups for products such as milk, juice coffee and sake, according to a 2023 news release.Nippon Dynawave didn't immediately respond to a request for comment when reached by USA TODAY. The Washington Department of Ecology also did not respond to an inquiry.