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State regulators have launched a formal investigation into a catastrophic chemical tank implosion at the Nippon Dynawave Packaging facility that killed 11 people and left others seriously injured.

The tank ruptured Tuesday at the Nippon Dynawave Packaging Co. facility in Longview, a city located along the southern Washington border with Oregon, killing 11 people.

In a joint statement, Nippon Dynawave Packaging Co. and local law enforcement said the tank's rupture caused "multiple critical injuries" as well as fatalities. Authorities said some victims suffered ...