OMAHA, Neb. -- An explosion Monday morning that brought down part of an animal feed processing plant in Omaha left two people dead and 10 others seriously hurt, authorities said.
The search for bodies in the crippled International Nutrition plant progressed slowly Monday, but the death toll wasn't likely to get bigger.
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Omaha Police Lt. Darci Tierney said Monday evening that all 38 of the workers who were in the building at the time had been accounted for. Through much of the day, authorities declined to say how many died while they sorted out what happened.
Officials say two died, 10 were hospitalized and seven were hurt but refused treatment. The other 19 workers escaped.
Search-and-rescue experts worked into Monday evening to stabilize the building. It wasn't immediately clear whether their work would continue into Tuesday.
"We haven't cleared the building yet because of the significant risk to our people," Interim Omaha Fire Chief Bernie Kanger said.
Authorities don't know what caused the blast, but Kanger noted that there were no hazardous chemicals at the plant. International Nutrition makes products that are added to livestock and poultry feed to make them more nutritious.
The Occupational Safety and Health Administration will determine the cause.
The explosion knocked out the lights in the building and sent workers scrambling for safety.
Nate Lewis said he was on the first floor when he heard the explosion. The building went dark, so the 21-year-old used light from his cellphone to make his way across the production floor and outside.
"I was a production line worker, although I don't know if I want to be that anymore," said Lewis, who's worked at International Nutrition for about four months.
Worker Jamar White said he heard a loud crack and looked up to see the back wall of the building collapsing.
"I ran at least 150 feet," White said. "I ran far enough to make sure nothing else would keep falling."
Afterward, White said, he could see inside the third floor of the building where at least two co-workers were screaming for help.
There appears to be structural damage to the top of the building, which sits in an industrial area visible from Interstate 80, which bisects Nebraska's largest city. There are no residences nearby and no other buildings were evacuated after the explosion.
Diane Stout said she'd heard from her husband, a manager on the plant maintenance crew, so she knew he was OK. The workers all know each other well, Stout said, so she was hoping to hear good news about friends there.
White's wife, Sarah White, said she was at home with her four children when her husband called her after the explosion.
"I could hear the panic in his voice," she said. "But he said he was OK." She said he'd been watching trucks unload from outside the building when the blast occurred.
"That's where he works every day. That could have been him," White said.