LAREDO, TX (NBC) - Federal Safety Investigators say a Texas driver who was suffering from acute sleep deficit failed to maintain his lane which caused his passenger bus to spin out of control.
The National Transporation Safety Board released its final report on the deadly accident that claimed the lives of nine people and injured 40 others two years ago.
The agency determined the bus left the road and rolled over when the driver overcorrected and abruptly braked.
Inspectors say the road was wet from recent rain and that the bus had an inoperable antilock braking system.
The bus began its trip in Brownsville and was en route to the Kickapoo Lucky Eagle Casino in Eagle Pass back in May of 2016.
A total of seven passengers died at the scene and two others passed as a result of their injuries.
The driver survived the wreck.