Staff from the Occupational Safety and Health Administration are in Omaha at the scene of an industrial accident that killed two and injured 17 on Monday.
Portions of the International Nutrition plant in south-central Omaha collapsed Monday morning after what witnesses described as some sort of explosion.
Authorities say 53-year-old Keith Everett was one of the people killed in the accident. Rescuers had to cease operations Monday night after recovering Everett's body, but began work on extracting the second person on Tuesday morning. That person's name has not yet been released.
U.S. Secretary of Labor Thomas Perez says OSHA will be conducting a full investigation into the cause of the accident.
"There are many questions yet to be answered about what caused this disaster," said Perez, "but I am confident that the answers provided by federal, state and local officials can offer lessons that will help avoid tragedies like this one in the future."
OSHA records show the plant has been cited before for safety violations, including for the 2002 death of a 45-year-old worker who died when he fell into a moving mixer he was cleaning.
Other records show that the plant, which makes nutritional products that are added to livestock and poultry feed, was cited for six violations in 2012.