Police said Gabriela Cedillo, 24, of Chicago, was driving on a closed set when the object crashed through the windshield of her car and struck her, WGN-TV, Chicago, reported Thursday.
Cedillo, who was driving her own vehicle in the scene, was an extra and not a stunt crew member, police said. The vehicle kept moving and striking a concrete barrier wall for nearly a mile before stopping.
Cedillo sustained a serious head injury, police said, and was taken to a hospital.
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