Security has been stepped up at the University of Iowaafter another death threat was delivered to a black student.The student found a threatening note and a box outside his apartment door.Last week, e-mail messages were sent to dental school students and stafflast week, demanding minorities be removed from campus and threatening gunviolence may occur.”This really rachets it up in terms of the security because this was anaction taken at someone’s home,” University of Iowa Vice President AnnRhodes said of the latest incident.Minority students are being offered help to find other places to stay ifthey don’t feel safe in their own homes.”If they feel uncomfortable or unsafe in their homes, we would be happy tofind other places for them to stay with faculty or classmates or others,”Rhodes said.Students from the University of Iowa business school are signing a letterof support to be sent to the dental school.”People, by signing the card and showing their support, show they actuallydo care,” said Ben Fagerlind, a business student.Students plan a unity rally next Tuesday on the Iowa City campus.In November, 1991, a disgruntled University of Iowa graduate student killedfive people and wounded another before turning the gun on himself in ashooting rampage which stretched from University offices to a classroom.