An implosion of a chemical tank at a pulp and paper mill in Washington state resulted in at least 10 injuries and an undisclosed number of fatalities or missing persons. Authorities confirmed deaths, though the exact toll remains unclear.

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...