At least one person has died, nine people were injured and nine employees remain unaccounted for after a large vat of chemical treatment product, including hazardous materials, ruptured at a paper and packaging facility in Washington state, fire officials said.

A tank of white liquor imploded at the Nippon Dynawave Packaging Company in southern Washington state on Tuesday.

A tank of white liquor imploded at the Nippon Dynawave Packaging Company in southern Washington state on Tuesday.

Authorities say several people suffered chemical burns and inhalation injuries when a tank containing hazardous liquid imploded at a pulp and paper mill in southwestern Washington…

Authorities have confirmed that one person died and 9 others remain unaccounted for after a chemical tank imploded at a pulp and paper mill in Washington state

The implosion of a chemical tank at a pulp and paper mill in Washington state killed an undisclosed number of people, local authorities and company officials confirmed

At least one person has died, nine people were injured and nine employees remain unaccounted for after a large vat of chemical treatment product, including hazardous materials,…

Nippon Dynawave Packaging Co. and local law enforcement said the tank's rupture caused "multiple critical injuries" as well as fatalities.

Nine patients from the site were taken to the PeaceHealth St. John Medical Center in Longview, the hospital told ABC. One had succumbed to their injuries.

Nippon Dynawave Packaging in Longview confirmed that several workers died when the toxic tank burst at 7.15am Tuesday. An official described the horror as a 'mass casualty scene.'

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Local officials released a joint statement saying a tank containing white liquor, a chemical used in the paper pulping process, had ruptured early Tuesday morning.

Authorities said some victims had suffered burns or inhalation injuries and there was no immediate threat to the public.

Multiple patients who suffered from chemical burns and other injuries were transported to nearby hospitals. Authorities said the implosion posed "no immediate threat to the…

The tank contained ‘white liquor’, a corrosive substance that consists mainly of sodium hydroxide and sodium sulphide.

Nippon Dynawave Packaging Co. and local first-response agencies confirmed that there had been fatalities.

A tank of 'white liquor' ruptured at the Nippon Dynawave plant in Longview.

Several injured people have been transported to hospitals to be treated for chemical burns.

Multiple people have died, and at least 10 others are believed to be injured following an implosion of a chemical tank in Washington State.

An implosion at a chemical tank inside a pulp and paper mill in southwestern Washington on Tuesday left one person dead and 9 others missing, according to local authorities and…

An implosion at a chemical tank inside a pulp and paper mill in southwestern Washington on Tuesday left one person dead and 9 others missing, according to local authorities and…