LITTLE ROCK, Ark. (AP) - An Arkansas State Police report on a bus crash that killed six migrant workers last month says the driver was "inattentive" in an unsafe manner, but a prosecutor says any charges will wait until state and federal investigations are done.

LITTLE ROCK, Ark. (AP) An Arkansas State Police report on a bus crash that killed six migrant workers last month says the driver was "inattentive" in an unsafe manner, but a prosecutor says any charges will wait until state and federal investigations are done.

The National Transportation Safety Board is looking at factors that could improve highway safety, while the state police are awaiting drug and alcohol reports. Pulaski County Prosecutor Larry Jegley said it's best to wait on their conclusions, to avoid surprises later.

A bus owned by Vasquez Citrus and Hauling of Lake Placid, Florida, left Interstate 40 on Nov. 6 and hit bridge supports. A state police report says the driver didn't have a commercial driver's license. The NTSB said the driver's records and licensing are part of its investigation.