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A machine using chemicals to make fiberglass cloth fire resistant appears to be the cause of an explosion where five people suffered injuries Tuesday inside the Zodiac Aerospace Plant in Newport, WA, officials said.

The sheer power of the blast Tuesday night and the shrapnel it created caused the majority of the damage, and little to no fire ignited at Zodiac Aerospace, said Brian Schaeffer, assistant chief of the Spokane Fire Department who responded to the scene.

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“The energy from that explosion went through that building almost like a tidal wave and destroyed or impacted everything in its path,” he said.

Schaeffer said the blast peeled open huge metal roll-up doors and led to multiple collapses in the large commercial building 50 miles north of Spokane.

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Thirty people were inside the plant, but most escaped with help from emergency systems, including sprinklers, Schaeffer said. The five people were hurt either from the pressure of the blast or penetrating injuries from shrapnel, he said.

Two victims ended up rushed to a Spokane hospital, where one was in critical condition and another in stable condition, Pend Oreille County Undersheriff Grant Sirevog said. Three others ended up treated and released from a hospital in town.

The state Department of Labor and Industries will investigate the explosion because it was an industrial accident with multiple injuries, agency spokesman Tim Church said.

The blast stemmed from vapors released while manufacturing chemicals used to make fire-resistant components for aircraft interiors, said Schaeffer, who responded with a hazardous-materials team.

It appeared a machine using chemicals to treat fiberglass cloth was to blame, Sirevog said.

But Zodiac Aerospace, a French company that makes aircraft components around the world, said in a news release said they do not know the cause of the explosion which the company will investigate along with government agencies.

“Our first thoughts go to our five colleagues who have been injured,” the company said.

The plant in Newport employs about 100 people and is one of seven Zodiac Aerospace facilities in the state.

The Newport plant is a “composite and engineered-materials facility.” It makes structural composites and assemblies, adhesives, panels with honeycomb core and various plastics, all used in the manufacture of aircraft cabin interiors.

Zodiac Aerospace is a major supplier of cabin interior products to Boeing. In the past year, as Boeing production ramped up, Zodiac Aerospace struggled to supply aircraft seats on time, creating a serious choke point in the supply chain.

The seat-supply shortage delayed a series of aircraft deliveries, including 787 Dreamliners to American Airlines.

Boeing spokesman Doug Alder said Wednesday the jet maker is “working to determine what, if any, impact there may be to our production system” from the Newport explosion.

Inside the plant, “the ceiling has come down and all (the sprinkler lines) that were bent and broken were pouring water onto the floor,” said Volunteer firefighter Chris Demlow. “It was just real loud, all the alarms were going off.”

Officials had been concerned about thousands of gallons of contaminated water from the plant reaching a nearby river after water lines ruptured and the sprinkler system activated and then broke, Schaeffer said.

Regulators responded and found no contamination outside the plant, state Department of Ecology spokeswoman Brooke Beeler said. No cleanup was required, she said.

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