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Deadly U.S. plant accidents under investigation in two states

International Nutrition, an Omaha animal feed processing plant, is seen after an explosion in this picture taken by Ofc. Mike Bossman, courtesy of the Omaha Police Department, in Omaha, Nebraska, January 20, 2014. CREDIT: REUTERS/OMAHA POLICE DEPARTMENT/HANDOUT VIA REUTERS
International Nutrition, an Omaha animal feed processing plant, is seen after an explosion in this picture taken by Ofc. Mike Bossman, courtesy of the Omaha Police Department, in Omaha, Nebraska, January 20, 2014. CREDIT: REUTERS/OMAHA POLICE DEPARTMENT/HANDOUT VIA REUTERS

By Carey Gillam

(Reuters) - A day after four workers died in two plant accidents in Nebraska and Oklahoma, authorities sought to determine what triggered the incidents while trying to recover the body of one victim trapped in the rubble, officials said Tuesday.

Two people died and 10 were injured Monday morning in Omaha, Nebraska, when the second floor of an animal feed plant collapsed. In Madill, Oklahoma, two workers died when a large industrial furnace exploded at a steel plant Monday afternoon.

A search and rescue team was working Tuesday to recover the body of one of the Nebraska feed plant workers caught in a pile of reinforced concrete and steel, authorities said. The body of a 53-year-old worker was recovered on Monday. Four people remained hospitalized.

In both the Nebraska and Oklahoma accidents, authorities said the triggers for the events were under investigation. Investigators were not certain if there was an actual explosion before the floor collapse at Omaha's International Nutrition plant, said Omaha Fire Department Battalion Chief Tim McCaw.

"Some people have said they heard an explosion and some indicated they did not," McCaw said. "All we know for sure is there was a collapse."

Investigators from the Bureau of Alcohol, Tobacco, Firearms and Explosives and the Occupational Safety and Health Administration (OSHA) were among those agencies called in to probe the incident, said McCaw.

Questions were similarly being asked in Oklahoma.

"We are hoping to get a preliminary investigation done today... that will tell us if it was accidental or intentional," Sam Schafnitt, chief of operations for the Oklahoma State Fire Marshall's Office, said of the explosion at the Mid American Steel and Wire plant.

The plant furnace, which is used to melt down metal and wire, exploded at about 4 p.m. local time Monday.

Officials at Mid American Steel and Wire declined to comment, as did officials at International Nutrition, which makes feed, vitamins and nutritional products for animals.

(Reporting by Carey Gillam in Kansas City; Editing by Stephen Powell)

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