The head of a hospital in nearby Waco has said that 94 people injured in the explosion have been treated so far and that most were wounded by flying debris.
Glenn Robinson, CEO of Hillcrest Medical Centre, told CNN that at least 19 patients would remain in hospital for the coming days at least.
He added that he has not witnessed any injuries related to chemical burns or the breathing of fumes.
A major rescue effort is ongoing in a Texas town devastated by a fertiliser plant explosion that has been likened to a nuclear bomb blast.
A huge explosion at a fertiliser plant in the Texan town of West has injured more than 160 people and caused widespread destruction.