People were treated for chemical burns and other injuries after an “implosion involving a vat of chemical treatment product” at the Nippon Dynawave Packaging Company in Longview, Wash., on Tuesday, officials said.

People were treated for chemical burns and other injuries after an “implosion involving a vat of chemical treatment product” at the Nippon Dynawave Packaging Company in Longview, Wash., on Tuesday, officials said.