The incident occurred on Tuesday at the Nippon Dynawave Packaging plant in Longview, where a massive storage tank containing a highly caustic industrial chemical ruptured during an early morning shift change, triggering a large-scale emergency response and search operation.

“We have recovered the ninth and final missing employee of this incident,” Longview Fire Department Chief Brad Hannig told reporters, confirming the end of the recovery effort.

Authorities had earlier reported two fatalities immediately following the accident, while nine workers remained unaccounted for amid difficult search conditions inside the industrial complex.

According to officials, the accident involved a 900,000-gallon tank holding a substantial quantity of white liquor, a chemical solution widely used in paper production. The tank ruptured after what authorities described as an implosion, releasing large volumes of the substance within the facility.

White liquor is a highly alkaline mixture containing sodium hydroxide and sodium sulfide. In the pulp and paper industry, it is used to break down wood chips into pulp, a key step in paper manufacturing.

The scale of the tank and the hazardous nature of the chemical complicated rescue and recovery efforts throughout the week, prompting a major response from local emergency services.

The facility is operated by Nippon Dynawave Packaging, a U.S.-based subsidiary of Japan’s Nippon Paper Group. According to company information, the plant manufactures paper-based packaging products and produces approximately eight billion single-serve containers annually for customers across North America, Asia and other international markets.

Authorities have not yet released details regarding the cause of the tank failure. Investigations into the incident are expected to examine operational procedures, equipment integrity and workplace safety conditions at the facility.

The accident ranks among the deadliest industrial incidents in Washington state in recent years and is likely to intensify scrutiny of chemical storage and safety practices within the pulp and paper manufacturing sector.

Rescuers worked by hand amid intense heat to clear debris from the collapsed structure, located about 80 kilometers north of Manila, avoiding the use of heavy machinery because of concerns that further movement of the wreckage could endanger any survivors trapped beneath the rubble.

Search operations intensified after overnight thermal scans detected signs consistent with heartbeats and breathing under the debris. K9 units were deployed while rescue workers inserted flexible tubes into voids within the wreckage to channel air into potential survival pockets beneath collapsed concrete, twisted metal and scaffolding.

Families gathered near the disaster site expressed frustration over the lack of information about missing relatives. Lea Casilao, whose husband is believed to be trapped beneath the rubble, said she had received no confirmation of his condition as rescue efforts continued.

Officials said the confirmed death toll rose to four after rescuers recovered a third body from the site. Maria Leah Sajili, information officer for the regional Bureau of Fire Protection, said one victim recovered earlier had initially shown signs of life but later died, while another suffered cardiac arrest while still trapped beneath the debris.

Authorities warned that additional victims could remain buried under the collapsed structure.
Among the fatalities was a 65-year-old Malaysian national whose body was recovered on Sunday from a neighboring hotel building that was also affected by the collapse, officials said.

Government agencies have opened an investigation into the incident and are seeking to locate the building owner to determine the circumstances surrounding the collapse and establish how many workers were present at the site when the structure failed.

Planning records showed the project had been approved as a nine-story condominium-hotel development. Authorities said, however, that construction work was underway on a swimming pool located on an additional 10th floor at the time of the collapse.

Geraldine Panlilio, regional director of the Department of Labour and Employment, told DZMM radio that the agency had issued a work stoppage order in September 2025 after inspectors identified multiple occupational health and safety violations at the site. The order was lifted one month later after the construction company complied with regulatory requirements.

The collapse has renewed scrutiny of construction safety oversight in the Philippines as investigators examine whether regulatory, structural or operational factors contributed to the failure of the multi-story building.