Video from the scene shows a vehicle upside down, surrounded by debris, on the roadway below the bridge.
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According to La Marque police, besides the one person who was killed, four additional occupants were seriously injured and taken to local hospitals.
Police said only one vehicle was involved in the deadly crash. It was unclear exactly what led up to the vehicle going over the bridge.
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The Galveston County Sheriff's Office is investigating the crash, along with the La Marque Police Department.