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POINT COMFORT, Texas -- There was a plant accident southwest of Houston on Friday.

Five people were hurt, in what's only being described as a chemical incident at the Formosa Plastics plant.

Four of the injured were brought to Houston by medical helicopter.

The plant has a history of accidents and safety violations.

Fourteen people were hurt in an explosion in May, and in 2005 an explosion injured more than a dozen workers.

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