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The deadly Jan. 20 collapse of the International Nutrition plant in Omaha was caused by overloaded storage bins, the federal Occupational Safety and Health Administration said Monday.

OSHA has proposed penalties of $120,560 and cited the company, a livestock feed supplement manufacturer, with one willful violation, one repeat violation and 11 additional safety violations for what it described as “failing to protect workers from hazards associated with structural collapse.”

“We strongly disagree with their report,” company President Steven Silver said Monday. “They spent six months investigating this whole accident and had no real reason why it happened.”

Silver said the company was not storing any more product than it typically would.

“There was nothing unusual,” he said.

An investigation found structural failure of what OSHA described as the east-side truss, after bins that the truss supported were loaded with “an excess of limestone.” The extra weight caused the bins to collapse three floors into the center of the facility in about 30 seconds, OSHA said.

The collapse killed two workers: David Ball, 47, and Keith Everett, 53.