First a derailment, then a fireball: An early morning freight train accident has part of Columbus, Ohio evacuated.

FOX News Radio's Jennifer Keiper reports

A freight train carrying ethanol comes to an abrupt stop near the Ohio State Fairgrounds, at least a dozen cars slamming into each other, several pushed to either side of the track. The mangled mess catches fire.

(Witness) "And then all of a sudden the flames started growing and a big huge fireball with a mushroom cloud - a big explosion shook the ground and it was tremendously hot."

(Witness) "What I saw was the light cast off of the fireproof warehouse that's next door and it was daylight for about two seconds."

About 100 people who live within one mile of the derailment have been evacuated as a precaution.

Jennifer Keiper, FOX News Radio.