Earl Steven Karr, responsible for the May-June 1984 Midwest pipe bombings that took place in Minnesota, Illinoise and Wisconsin, was arrested in Iowa while after a pipe bomb detonated in the trunk of his car.
The 1984 Midwest pipe bombing was a plot involving a series of pipe-bombs planted in Minnesota, Illinois and Wisconsin, by Earl Steven Karr. In May and June 1984, an American, Earl Steven Karr, planted over 20 pipe-bombs about Minnesota, Illinois and Wisconsin. He was arrested in Mason City, Iowa after a pipe-bomb he was transporting detonated in the trunk of his car. 
