No Explosives Found After Bomb Threats at Colleges DALLAS - The authorities in Texas and North Dakota said on Friday that they had found no explosives after two large public universities were evacuated over bomb threats - false alarms that forced tens of thousands of students and staff members to flee in the middle of classes at the University of Texas at Austin and at North Dakota State University in Fargo. In Austin, William Powers Jr., the university's president, said at a news conference on Friday that campus buildings had been checked and that he was confident the campus was safe. But while the university did allow access to buildings Friday afternoon, officials canceled classes for the day. At North Dakota State, which has 14,000 students, school officials ordered an evacuation Friday morning after receiving a separate bomb threat, but had reopened campus by 1 p.m., officials said. Classes were to resume at 2 p.m. It is not clear who made the threats or whether they were connected, officials said. At the University of Texas, a message posted on the university's Web site said: "Evacuation due to threats on campus. Immediately evacuate ALL buildings and get as far away as possible. More information to come. Rhonda Weldon, a spokeswoman, said the university had received a phone call at 8:35 a.m. from a man she described as having a "Middle Eastern accent." Ms. Weldon said that the man had claimed "to have placed bombs all over campus." "He stated these bombs would go off in 90 minutes," she said. The university, which has an enrollment of about 51,000 students and 24,000 staff and faculty members, decided to evacuate the entire campus "out of an abundance of caution," said Ms. Weldon. A professor who was on campus at the time said that the evacuation had proceeded calmly and smoothly for the most part. "There was no sense of panic," said the professor, who asked that his name not be used, and who was driving away from campus as he spoke. I think people were just wondering what was going on and how seriously to take it. In Fargo, the university had posted a large red notice on its Web site saying, "Urgent Security Alert," and ordered "all employees and students to leave campus by 10:15 a.m. This includes residence hall students, who, if necessary, should walk to locations off campus. This also includes the downtown buildings and agricultural facilities.