DES MOINES, Iowa (AP) — Authorities say it's surprising no one was killed in a chain reaction accident on Interstate 80 in eastern Iowa on Friday afternoon that sent 32 people to area hospitals.

The Iowa State Patrol says an accident had halted traffic on the interstate near Williamsburg at around 3 p.m. but a semitrailer driven by a Portland, Oregon, man didn't stop causing a chain reaction crash involving four other vehicles. Included was a tour bus carrying 26 employees from the Ryan Companies, a Cedar Rapids commercial real estate company.

The semi burst into flames upon impact and spread diesel fuel across the interstate catching other vehicles on fire.

University Hospitals in Iowa City say 12 people were treated. Others were taken to hospitals in Iowa City and Marengo.

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