DALLAS (AP) - Five workers were burned, three of them critically, in an accident at a cement plant near Dallas.

The accident happened late Thursday afternoon at the TXI Cement Co. plant in Midlothian, about 25 miles southwest of Dallas.

In a statement issued Thursday evening, TXI said it had few details on how the five were injured, but that they suffered their burns while doing maintenance work in a kiln in the main processing area of the plant.

The three worst-injured workers were airlifted to Parkland Memorial Hospital in Dallas, while two others were taken to hospitals by ambulance.

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