New York Gov. Andrew Cuomo is ordering the state inspector general's office to begin an investigation into how the operator of a tour bus that crashed had a commercial driver's license despite his poor driving and criminal record.

A state official familiar with the investigation told The Associated Press on Monday that driver Ophadell Williams had a log book that was incomplete for several days before the crash. Commercial drivers need to keep a log book to track their travels and hours behind the wheel.

The official spoke on the condition of anonymity because of the sensitivity of the investigation.

Officials say Williams has a criminal record that includes convictions for manslaughter and grand larceny. Authorities say Williams spent two years in prison for his role in a 1990 stabbing. He was also sent to prison for three more years in 1997 for stealing a check worth more than $83,000.

Transportation officials plan to interview Williams on Tuesday.

Williams told police that his bus was clipped by a tractor-trailer before it crashed, killing 15 people. Witnesses say he swerved at times.

15th victim dies after tour bus accidentSurvivors of deadly bus accident refute driver's story