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Several injured people have been transported to hospitals to be treated for chemical burns.

A chemical tank has imploded at a Nippon Dynawave Packaging facility in the US state of Washington, killing several people and critically injuring others, authorities said.

Emergency responders on Tuesday remained at the site in the city of Longview in Cowlitz County, about 70km (45 miles) north of Portland, Oregon, the Longview Fire Department said in a joint written statement with Nippon and the Cowlitz County Sheriff’s Department.

Multiple patients who suffered from chemical burns and other injuries were transported to nearby hospitals. Authorities said the implosion posed “no immediate threat to the surrounding community”.

The statement said that officials “can confirm fatalities related to the incident” along with “multiple critical injuries”, but did not provide figures.

At least nine workers and one firefighter were taken to hospitals from the site, said Scott Goldstein, the Cowlitz 2 Fire and Rescue chief who was among those who responded. The number of deaths was “undetermined”, he said at a news conference.

PeaceHealth St John Medical Center in Longview told ABC News it had seen nine patients related to the incident, including one who had died. Six of the patients were in fair condition, and two other patients had been transferred to other facilities, the hospital told ABC.

The joint statement said that a tank containing “white liquor”, a chemical solution of sodium hydroxide and sodium sulfide used in the production of paper pulp, had ruptured at about 7:15am local time (14:15 GMT).

Goldstein said at the news conference that the 80,000-gallon (about 300,000-litre) tank was approximately 60 percent full.

In southern California, meanwhile, authorities have been monitoring an overheating industrial tank containing methyl methacrylate, a highly flammable chemical used in the production of plastics. The worst-case possibility of an explosion was ruled out on Monday at the GKN Aerospace facility in Garden Grove after a crack relieved some of the mounting pressure, officials said.

Orange County Fire Authority spokesman Greg Barta said in an update on Tuesday morning that the temperature in the tank was holding steady and that crews were working to ensure that people evacuated could get home as soon as possible.

May 26 (UPI) — An implosion at a manufacturing facility in Washington killed multiple people and injured 10 others, including a firefighter, local authorities said Tuesday.

The implosion at the Nippon Dynawave Packaging facility in Longview, Wash., happened around 7:20 a.m. The facility is a pulp and paper mill, and the implosion involved a vat of a chemical used in paper treatment called white liquor.

White liquor is made of sodium hydroxide, sodium sulfide and disodium carbonate, Cowlitz County fire chief Scott Goldstein told NBC News.

The Longview Fire Department said there was no immediate threat to the public, but the implosion killed multiple people and caused chemical burns and other injuries to others. Officials transported multiple people — including one firefighter — to hospitals in Longview and Vancouver.

Officials haven’t specified how many were among the dead. The Seattle Times reported that emergency responders were also searching for potentially missing people.

Goldstein said some of the injuries were minor while others were more critical.

Washington State Department of Ecology spokeswoman Anna Izenman told The Times that spill responders were on site evaluating any potential environmental impacts from the incident. She said white liquor can’t be collected and cleaned up in the same manner as oil; it can only “self-neutralize” with water over time.

May 9 (UPI) — Multiple injuries were reported Saturday in what rescuers called a “mass casualty” event involving a possible boat explosion at a popular Miami sandbar.

First responders to the scene of a possible boat explosion at around 12:45 p.m. “found multiple patients with various injuries, some burned, some minor injuries,” Miami-Dade Fire Rescue Battalion Chief Juan Arias told reporters.

“All patients were treated and transported to local hospitals,” he said, adding that the incident was designated as a “level 2 mass casualty incident, which gives us the sufficient amount of units on scene to go ahead and deal with the number of patients that we had.”

Arias said the injuries were from burns and that some victims suffered “traumatic” injuries.

The U.S. Coast Guard and Florida Fish and Wildlife Commission personnel also responded to the scene at Haulover Sandbar, a favorite party cruise spot for tourists located in Biscayne Bay north of Bal Harbour, Fla.

Arias did not specify how many people were injured in the incident, but multiple media reports quoted rescuers as saying 11 people were taken to area hospitals.

Witnesses said the injuries were caused by an explosion aboard a boat which knocked several people overboard and left them with burns.

A marina worker told WTVJ-TV the explosion was caused by a gas leak that happened when the boat’s captain turned on the ignition. Another person who was aboard the boat told the broadcaster there were 14 people on the vessel before the explosion.

An investigation into the incident was continuing into Saturday night.