A second person who was injured when a large chemical tank ruptured at a Washington state paper mill has died, authorities said Wednesday, bringing the presumed death toll to 11, including nine people who were still missing.

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