NTSB: Investigation Continues Into Fatal Bronx Bus Crash

At a Sunday evening news conference, NTSB Vice Chairman Christopher Hart announced that the bus' black box was found and has been sent to Washington, D.C to be reviewed.

Published reports say the officials are looking into whether the driver, Ophadell Williams, fell asleep at the wheel.

Williams, 40, was driving the World Wide Tours bus when he apparently lost control and crashed on the New England Thruway early Saturday. The bus slammed into a guard rail, overturned and hit a sign post, slicing the roof off nearly end-to-end at window level.

According to the Federal Motor Carrier Safety Administration, drivers with World Wide Tours had been cited five times for fatigued driving just in the past two years. Records also show World Wide Tours was involved in crashes in New York in 2009 and last year in New Jersey, both of which resulted in an injured passenger.

A number of passengers in Sunday's crash are contradicting the driver's statement to police that the bus was side-swiped by a tractor-trailer. A law enforcement official tells the Associated Press that several passengers say that prior to the crash, the driver swerved several times for no apparent reason.

While visiting some of the victims at the hospital Sunday, Mayor Michael Bloomberg said investigators will piece together what happened to make future bus rides safer.