The final report said the cause of the crash was a 17-year-old Ohio girl who attempted to pass a tanker filled with hazardous chemicals. 

A federal report on a tanker-truck crash a year ago in central Illinois that spilled a toxic chemical and killed five people includes an interview with a 17-year-old Ohio girl who concedes that the truck was forced off the road when she passed it with the minivan she was driving. The tanker, carrying caustic anhydrous ammonia, left the road and jackknifed when the girl passed it in her family's minivan. The truck spilled much of the load in Teutopolis, a community about 110 miles northeast of St. Louis. The Illinois State Police said it turned over its investigation to the local county prosecutor.