At least six of more than 30 people injured when a bus drove off an interstate and overturned remain hospitalized in southwest Ohio. Butler County Sheriff's deputies say a Greyhound bus struck a tree and a fence and flipped on its side before sliding to a stop in a cornfield early Saturday. The bus carrying 51 passengers had been heading northbound on I-75 from Cincinnati to Detroit. The cause remains under investigation. Greyhound says the driver - 64-year-old Dwayne Garrett of Cincinnati - was experienced and fully rested. The company says the bus also recently passed an inspection.