Explosion and fire at Pueblo concrete tie plant injures a worker.

One person has been flown by helicopter to a Denver hospital after an explosion and industrial fire at a concrete tie plant in Pueblo.

The incident happened at about 10:35 a.m. Tuesday at the Rocla concrete tie plant, 3201 Lime Road, according to the Pueblo Fire Department.

The explosion and fire produced heavy, black smoke as it burned through a work and storage area at the plant, said Woody Percival, a fire department spokesman.

The fire was in a covered lean to structure, about 12,000 square feet, filled with wooden pallets, cardboard and other flammable materials, Percival said.

“It’s been a real-hard fire to put out,” he said. At one point, about 65 firefighters were at the scene battling the intense fire.

The explosion happened when a worker using a welding torch sparked a container with a petroleum product, likely transmission fluid or motor oil, Percival said.

The fire was contained to the work area and did not spread to an attached office and administration building. No firefighters or other workers were injured.

Pueblo fire crews, with assist from other area fire departments, remained on the scene Tuesday afternoon.

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