An explosion and subsequent fire at the Horizon Biofuels plant in Fremont have left three individuals unaccounted for. Emergency crews are on-site responding to the incident, which has caused significant damage to the facility and disrupted search efforts. Videos and photos from the scene reveal a large fire and destruction, sparking shock within the community. Authorities are currently unable to resume search operations due to the hazardous conditions created by the explosion. The company has a history of multiple OSHA violations, raising concerns surrounding workplace safety.