4 Die in Houston Traffic Accident, Truck Rolls

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Houston police say four men have been killed in a pickup truck rollover that left another passenger severely hurt.

Police are trying to determine what caused the wreck. Toxicology tests have been ordered on the driver, who was among the fatalities Sunday.

Investigators say the vehicle hit a curb before rolling, leaving the driver and two passengers dead at the scene. Two other passengers were transported to a Houston hospital, where one of them died.

Names of the victims and further details on the survivor weren't immediately available.