Two of the 38 workers who were at the International Nutrition plant on Monday morning died and 10 were hospitalized with significant injuries, authorities said. A firefighter was also sent to the hospital with an injured hand.
An urban recovery team of firefighters resumed efforts Tuesday morning to recover the body of one of the workers killed. Officials have not released that victim's name. The body of Keith Everett, 53, was pulled from the debris Monday afternoon.
Jamar White said he had a narrow escape. He was outside the plant watching trucks unload when 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."
Key structural supports failed after the blast, and the second and third floors of the plant collapsed on top of the first floor. The blast knocked out the lights in the building and sent workers fleeing for safety.
Authorities don't know what caused the blast. Omaha Interim Fire Chief Bernie Kanger said at a news conference Monday night that he couldn't say for sure there was an explosion, though workers and other witnesses described hearing a blast.
The Occupational Safety and Health Administration will investigate the cause of the accident; Kanger said that could take weeks. He noted there were no hazardous chemicals at the International Nutrition plant, which makes nutritional products that are added to livestock and poultry feed.
Messages left Tuesday at local and regional OSHA offices seeking information on the investigation were not immediately returned. Online records show the federal agency fined International Nutrition more than $13,000 after a 45-year-old worker was killed in 2002 when he fell into a moving mixer he was cleaning.
On Monday, firefighters were able to rescue five men initially, including one who was cut from the debris, Kanger said. Search-and-rescue experts worked into Monday evening to stabilize the building and remove Everett's body.
A combination of strong winds, cold temperatures and the dangerous rubble forced rescuers to suspend operations before the second victim could be recovered, Kanger said.
"We've got tens of thousands of pounds of concrete, reinforced concrete and steel," Kanger said, noting the search effort and investigation will resume Tuesday morning. "This is a very significant rescue operation."
White's wife, Sarah White, said she was at home with her four children when her husband called after the explosion.
"I could hear the panic in his voice," she said.
She spent the morning waiting with other workers' families for updates on their loved ones
"All of the people who are hurt are people he works with every day," she said. "I know that? he's OK, but it's still emotional because I know I could be one of those families crying."
Worker 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 been at the plant for about four months.
Associated Press writer Margery A. Beck in Omaha, Neb., contributed to this report.
Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.