WASHINGTON (AP) — A tour bus crash last year that claimed 15 lives was caused by a driver suffering from too little sleep and a bus company that provided too little safety oversight, the National Transportation Safety Board said Tuesday.

The five-member board, in a unanimous vote, said the driver, Ophadell Williams, had almost no sleep in the three days leading up to the March 12, 2011, accident except for naps he took on the bus while passengers were inside a Connecticut casino gambling.

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