Cresson Mayor Bob Cornett says searchers entered the wreckage late Thursday afternoon thinking they knew where the worker was, but their search was fruitless.
A witness working near the plant claimed the fire smelt like sulfur and said "things were blowing out of the roof".
The Forth Worth Fire Department was sending units to the plant near Cresson, located at the corner of three counties.
The fire was reported at around 10 a.m. on Thursday. "Then, the fire", Jesse Bailey, who works next door to the plant, told the local NBC station.
Hood County Sheriff's Lt. Johnny Rose said fertilizers were not stored at the plant. However, local ABC affiliate WFAA is now reporting that at least two people were injured by the incident.
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The explosion at Tri Chem Industries happened about 9:45 a.m. and resulted in a fire that sent large amounts of dark smoke into the air of Cresson.
Rhodes says that from City Hall, she could see black smoke coming from the plant, which is several miles away. The Hood County Sheriff, Rogers Deeds, told reporters that one employee was rushed to hospital after suffering third-degree burns while another employee is still missing. So far, there have been no evacuations in the area.
Texas Highway 171, which is adjacent to the plant, was closed to traffic.
The explosion remains under investigation.
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.