More than 150 people have been treated for injuries relating to the fire and explosion. Several firefighters remain unaccounted for and a law enforcement constable and firefighter who had gone missing has been located with serious injuries, reports ABC News .
The Bureau of Alcohol, Tobacco, Firearms, and Explosives has sent a team to the site to determine if the cause of the fire and explosion at the fertilizer plant was accidental or criminal.
The explosion was captured on cell phone video here .