UPDATE: According to Cresson Mayor Cornett, investigators believe the fire was sparked after a worker "dragged his foot along the floor of the plant while chemicals were being mixed", NBC reported.
Hood County Fire Marshal Ray Wilson said Friday that about half of the 15,000-square-foot (1,400-square-meter) Tri-Chem Industries plant has caved in and remains on fire.
Sheriff Roger Deeds told CBS 11 News that one person was missing and another badly injured in the blast that happened at Tri-Chem Industries, in the city of Cresson on State Highway 171.
He says they searched the front half of the building on Thursday and Friday and haven't found the missing worker, who is presumed dead. Two workers were taken to hospitals, one of them with life-threatening burns.
About a dozen people work at the chemical plant, which is about a year old, according to NBC 5.
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Dylan Mitchell is believed to have been inside the Tri-Chem Industries plant, which is located in Cresson, about 20 miles outside of Fort Worth, when something sparked a fire and an explosion consumed the building, NBC Dallas-Fort Worth reported.
Two of Mitchell's coworkers were rescued and sent to the hospital with injuries. Cornett told AP that the plant mixes chemicals used mainly by the oil and gas industry to drill disposal wells.
Cornett said that the wind was carrying black smoke and fumes emanating from the plant away from residents, but that the city could issue an evacuation order if the wind direction changed. It's not clear how numerous chemicals stored at the plant were hazardous.
A fire at a Texas chemical plant has critically injured one worker and another is missing.
Texas Commission on Environmental Quality spokesman Brian McGovern did not immediately respond to a request for information.