Federal authorities will begin investigating what caused a charter bus headed to a casino to crash in far South Texas, killing eight people and injuring 44 others in a one-vehicle rollover.

Texas Department of Public Safety Trooper Conrad Hein says seven people died at the scene Saturday on U.S. Highway 83 about 46 miles north of Laredo and another died later at a Laredo hospital. Hein says "the driver of the bus lost control and rolled over."

Hein says the driver was among the survivors. His name and the names of passengers were not immediately available.

Authorities say it was raining Saturday morning but it was uncertain if that was a factor in the crash.

National Transportation Safety Board investigators were expected to begin probing the wreck Sunday.

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Information from: Laredo Morning Times, http://www.lmtonline.com