The implosion of a chemical tank at a pulp and paper mill in southwestern Washington state on Tuesday injured at least 10 people, while an undisclosed number of others had been killed or remained missing, authorities said. In a joint statement, Nippon Dynawave Packaging and local first response agencies confirmed there had been fatalities. Cowlitz Fire and Rescue Chief Scott Goldstein later told a news conference that it was unclear how many workers had been killed. Asked how many remained...