A bus from West Georgia Technical College overturned Friday morning along Interstate 81 in Pulaski County, Va., injuring 13 people.

The crash happened shortly before 8:15 a.m., according to the Virginia State Police.

The bus was northbound on the interstate when the bus drifted into an adjacent lane, side-swiping a tractor-trailer before running off of the road and overturning.

The bus driver, 59-year-old Willie F. Walker of Carrollton was charged with driving under the influence of drugs and possession of marijuana. Fatigue may have also been a factor. He was booked into the New River Valley Regional Jail.

Willie Walker, 59, of Carrollton, GA, has been charged with DUI-Drugs, and Possession of Marijuana (New River Valley Regional Jail)