Multiple people killed and others missing after chemical explosion at US paper mill

Multiple people have been killed and injured and some are still missing after a major chemical explosion at a paper mill in Washington, authorities said.

The explosion occurred at 07:15 PDT (15:15 GMT) at the Nippon Dynawave Packaging facility in Longview, 130 miles (210km) south of Seattle.

Investigators said in a news conference on Tuesday that 10 people have been injured and transported to hospital. Officials have not yet said how many people have died or are unaccounted for.

The explosion occurred due a "rupture of a tank containing white liquor", the company said in a statement. White liquor is a highly corrosive chemical used in the paper-making process.

Cowlitz Fire and Rescue Chief Scott Goldstein said there are an "unknown number of fatalities at this moment," adding that officials have "confirmed that there are fatalities, but the exact number is undetermined".

Nine of the people injured are employees at the factory, and one is a firefighter, Goldstein said. Their injuries range from "critical severe to minor", and include burn and inhalation injuries. The company statement said there were "multiple critical injuries".

The tank that ruptured holds about 80,000 gallons (300,000 litres), he said, and it was roughly 60% full when the explosion occurred.

The scene is stable, the chief said, but the public should stay away from the area as firefighting efforts continue. He said the fire does not pose any threat to the larger community.

"The scene remains in the recovery phase as emergency responders continue operations," the Longview Fire Department said in a statement.

"No identifying information regarding injured or deceased individuals will be released at this time pending notification of family members."

White liquor is an alkaline chemical containing sodium hydroxide and sodium sulfide.

Washington Governor Bob Ferguson said state ecology workers have been sent to the site to assist local officials.

"I'm deeply saddened to hear that there have been fatalities," Ferguson said in a statement.

"My thoughts are with the workers and their families, and with the first responders."

According to local media, the Nippon Dynawave Packaging facility was also the scene of a major fire in July 2023, when piles of wood at the site burned for days.

The plant makes tissues, printer paper, cups, plates, cartons, and other goods, according to CBS, the BBC's US partner. It employees 1,000 people, according to the Washington State Department of Ecology.

The explosion comes as officials in California say a chemical tank that threatened to explode has now been rendered safe.

The tank in Orange County contains a plastic-making chemical, and its possible explosion led to an evacuation order affecting 50,000 people.

Officials in Washington say no evacuation order is needed.