The likely death toll rose to 11, including the missing, after another person who was injured died, authorities said Wednesday.

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

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.'

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…