Federal investigators say overloaded storage bins on the roof of an Omaha livestock feed manufacturer's plant caused the building collapse that killed two people in January.
The Occupational Safety and Health Administration announced its findings Monday and cited International Nutrition for 16 violations of safety and health rules.
Regulators are proposing $120,560 in penalties and want to impose strict oversight on the company because of the violations.
International Nutrition officials declined to comment on the report Monday morning because they haven't had a chance to review the decision.
OSHA says nine storage bins on the plant's roof were overloaded, and the additional weight caused three floors to collapse inward in about 30 seconds.
The Jan. 20 collapse killed 47-year-old David Ball and 53-year-old Keith Everett and injured several others.