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PHILADELPHIA (CBS) — More than 20 people are hurt after a big explosion at a plant in Texas.

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It happened Saturday in Pasadena, a city outside of Houston.

About 266 people were in the chemical plant when the fire suddenly started.

First responders say a broken valve leaked ethylene and sparked a flash fire that sent everyone running.

Those hospitalized suffered knee injuries and burns to the back.

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Two people were hurt so badly, they had to be airlifted to the hospital.

Everyone is expected to survive.