Investigators said Robert Koehler, 22, who was not graduating, was arrested after tossing toilet paper into the crowd of students during the University of Iowa College of Liberal Arts commencement ceremony Saturday, the Iowa City Press-Citizen reported Tuesday.
Koehler told the Press-Citizen Monday he was trying to "lighten up the erroneously long graduation ceremony and stimulate a unified celebration for all the graduates at the commencement."
Koehler has pleaded not guilty to a charge of disorderly conduct.
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