NEW : 54 people are killed in a vehicle pileup on a Texas highway . Hospital : Two people remain in critical condition . Poor visibility stemming from a mixture of fog and smoke probably caused the wreck , authorities said . NEW : Texas State Highway 73 is shut down after a pileup involving at least 50 vehicles . It was likely caused by poor visibility stemming from a mixture of smoke and fog .
NEW : 54 people are killed in a vehicle pileup on a Texas highway . Hospital : Two people remain in critical condition . NEW : Texas State Highway 73 is shut down after a pileup involving at least 50 vehicles . It was likely caused by poor visibility stemming from a mixture of smoke and fog .