ISU strange incident

I have a friend whose older brother attends ISU, and the day after the NIU shootings someone found a note on the floor or their dormitory that said (I can't remember perfectly) NIU, now it's ISU's turn. I'm not quite sure if anything was done about it. I have not talked to my friend further on the issue. Some of the people in his brother's dormitory said that it could be a joke, however, who would joke about that? Then again I'm sure that there is some person out there who finds that funny...