FREMONT, Neb. (WOWT) - The independent federal board that has been investigating the fatal explosion at Horizon Biofuels released an updated report on Wednesday.

“This terrible tragedy should not have happened,” said Steve Owens, chairman of the U.S. Chemical Safety and Hazard Investigation Board, known as CSB. “Preliminary evidence points to a combustible wood dust explosion, a well-known — and completely avoidable — hazard in wood processing.”

CSB is still investigating the incident, saying the facility is still unsafe and could be structurally compromised, which has kept their investigators from being able to get close to the building. Specifically, they are working to analyze several key areas that include:

Cause or probable cause of the initiating dispersion of dust

Events and c

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