Two people believed to be workers at the chemical plant were taken by emergency helicopter to local hospitals. Their conditions were not immediately released.

\"PHOTO:
KTRK
PHOTO: A chemical plant explosion in Crosby, Texas on April 2, 2019.
>

The Harris County Fire Marshals Office initially said one person was unaccounted for. It was not clear if that was the person who died.

\"Our hearts and prayers go out to the individuals involved, as well as our first responders, employees, and our community,\" John Foley, the company's president, said in a statement. \"The wellbeing of our people, neighbors and the environment remain our top priorities.\"

The blast shook homes in the neighboring area and a woman a mile from the plant was knocked to the ground, according to ABC station KTRK. People 20 miles away reported feeling the explosion, the station reported.

Harris County Sheriff Ed Gonzalez issued an order for schools and homes within a mile to shelter in place.

Gonzalez tweeted that a preliminary investigation indicates a fire started in a transfer line to a tank containing a colorless, flammable gas called isobutylene. He said the blaze then spread to a storage building.

A shelter in place has been ordered for all residents within a 1-mile radius of the #KMCO plant fire in Crosby at 16503 Ramsey Rd. #HouNews pic.twitter.com/BdEJcKoNPn

— HCSOTexas (@HCSOTexas) April 2, 2019

There was no immediate word on what other chemicals were burning, but the plant primarily manufactures antifreeze products, according to KTRK.

\"PHOTO:
KTRK
PHOTO: A chemical plant explosion in Crosby, Texas on April 2, 2019.
>

Workers at the plant said they were warned of a leak and were ordered to evacuate just moments before a series of explosions erupted followed by the massive blast.

\"Just run, that’s it,\" plant worker Randy Villalobos told KTRK. \"It was scary. Very scary. Everybody that was around me was running.\"

Villalobos said he and about 20 other workers immediately ran to an exit gate only to find it locked.

Crosby Plant fire: arriving in the general area. Information is preliminary: schools have sheltered in place, a few pops have been heard, air seems to be moving in Southwest direction. #HouNews pic.twitter.com/jFECk4g8AJ

— Ed Gonzalez (@SheriffEd_HCSO) April 2, 2019

\"Everybody that was around me was running,\" Villalobos said. \"We had to cross underneath a gate because the gate was locked at the time.\"

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