The Journal News, Frank Becerra Jr.) MANDATORY CREDIT; NY METRO OUT; TV OUT; MAGS OUT; NO SALES, Associated Press
FILE- In this March 12, 2011 file photo, emergency personnel respond to the bus crash on Interstate 95 in the Bronx borough of New York. Fifteen people died when the bus, returning to New York from a casino in Connecticut, flipped onto its side and was sliced in half by the support pole for a large sign. New York State will devote $1 million to change the way buses are inspected in the state following a spate of fatal crashes in 2011.

WASHINGTON — Federal officials say a deadly New York tour bus crash last year was caused by a driver suffering from fatigue.

The National Transportation Safety Board, in a unanimous vote Tuesday, said the bus company, World Wide Tours of Greater New York, was also to blame for not providing adequate safety oversight of the driver, Ophadell Williams.

Federal regulators shut down the bus company for safety violations after the March 12, 2011, accident that claimed 15 lives. But the company's employees, buses and other assets were transferred to a closely related bus company that continues to operate, investigators said.

The bus was returning to New York's Chinatown from an overnight trip to a casino when it clattered along a highway guard rail, toppled over and crashed into the support pole for a highway sign.