Authorities say a grand jury will review the double-decker bus crash that killed four people in upstate New York.

Onondaga County prosecutor William Fitzpatrick says the panel will be asked to look into the roles of the Megabus driver and railroad company CSX, which owns the bridge the bus slammed into after a wrong turn on its way to the Syracuse terminal.

Fitzpatrick said Friday the driver could be charged if the grand jury decides his use of a personal GPS device and failure to heed signs warning of the low bridge amounted to criminal negligence. Fitzpatrick also wants a review of what CSX knew about dangers posed by the bridge in suburban Salina.

No charges have been filed. The Philadelphia-to-Toronto bus crashed in the dark early on the morning of Sept. 11.