BLACKSBURG, Va. -- There were more anxious moments today on the jittery Virginia Tech campus. University police say someone telephoned in a threat against the school's president. Also this morning we learned that the gunman in Monday's rampage was no stranger to law enforcement. Seung-Hiu Cho was no stranger to Virginia Tech police. On multiple occasions in late 2005 officers talked to Cho after female students complained about being harassed with text messages and other contact. One acquaintance even warned police that Cho was suicidal. Out of concern for Cho officers ask him to speak with a counselor. He went voluntarily to the police department. Based on that interaction with that counselor a temporary detention order was obtained and Cho was taken to the mental health facility. Cho's roommates say he often obsessed about women and classmates claim he would take inappropriate cell phone pictures of girls during lecture. His dark and twisted writings so unnerved his English tutor that she worked out a code with her assistant to call security if she mentioned a specific word. Still, Virginia tech administrators said their hands were tied. Cho's tutor Lucinda Roy said, "They said he's not going to kill someone. My argument is he seemed so disturbed anyway, we need to do something about this." In the days leading up to the shootings Cho's roommates say his behavior -- which was strange to begin with -- became even more unpredictable. Cho's roommate Joseph Aust said, "He started getting up a lot earlier. Throughout the year he would get up at maybe 7:00 or so, but the past couple weeks he got up at like 6:00 or 5:30 even." Police say, despite the multiple complaints filed against Cho there was nothing in his record to prevent him from buying a gun.