A second round of e-mail threats has hit the University of Iowa.Investigators are trying to track down the origin of the e-mails which were sent to students and faculty in the College of Dentistry. They threaten property damage & the use of firearms if all minority students are not removed from campus. One U-of-I student says he’s trying to go about his usual life.E-mails on Tuesday hinted at violence but the messages sent last night said students should not only fear for their future careers, but their lives. One student, who asked to remain anonymous, says every student is handling the threat in their own way.He says the content of the messages makes it clear someone out there is disturbed.Investigators have worked through the night trying to trace the author or authors of the e-mails. The messages were reportedly sent using “Excite-dot-com” but it’s still unclear where they came from.