Federal safety investigators in Nebraska are looking into structural problems as one of the likely contributors to an industrial building collapse in Omaha, Nebraska, which claimed the lives of two workers and injured a further 17.

Inspectors with the U.S. Occupational Safety and Health Administration are working with structural engineers and combustible dust experts as part of their investigation into a disastrous accident at the International Nutrition plant. The accident saw the roof and third floor of the facility, which produced nutritional products for livestock and…