North Dakota State University officials are ordering the campus evacuated after receiving a bomb threat.
NDSU issued a statement shortly before 10 a.m. Friday telling all employees and students to leave campus within a half-hour because of a bomb threat.
Students in residence halls have been told to walk to locations off campus. No other details were given.
The University of Texas at Austin also has ordered an evacuation after receiving a bomb threat. It is not known if the two threats are related.
More than 14,000 students are enrolled at NDSU.
Thousands of people streamed off university campuses in Texas and North Dakota on Friday after phoned-in bomb threats prompted evacuations and officials warned students and faculty to get away as quickly as possible. No bombs were found on either campus by early afternoon it was not clear whether the threats were related.
The University of Texas received a call about 8:35 a.m. from a man claiming to be with Al Qaeda who said he had placed bombs all over the 50,000-student Austin campus, according to University of Texas spokeswoman Rhonda Weldon. He claimed the bombs would go off in 90 minutes and all buildings were evacuated at 9:50 a.m. as a precaution, Weldon said.
The deadline passed without incident, and the university later issued advisories saying all buildings has been cleared and were reopening by noon. Classes were canceled for the remainder of Friday, but other university activities were to resume by 5 p.m.
North Dakota State University President Dean Bresciani said 20,000 people also were evacuated from his school's main and downtown campuses in Fargo after the school received its bomb threat Friday morning. Officials did not immediately release details about the North Dakota threat and its evacuation remained in place by early afternoon.
In Texas, sirens wailed on campus and cellphones pinged with text messages when the initial alert when out. Students described more confusion than panic as they exited the sprawling campus in what one described as an "orderly but tense" manner. Students said they were directed off campus by university staff.
"One of them said to me `get off this campus as soon as possible,"' said Elizabeth Gerberich, an 18-year-old freshman from New Jersey.
Police blocked off roads heading into campus as lines of cars sat in gridlock trying to get out.
At the football stadium, executive senior associate athletics director Ed Goble said he was discussing logistics with authorities because the Longhorns needed to get ready to leave for a Saturday football game at the University of Mississippi. Shortly after 11 a.m., while the rest of campus remained almost entirely deserted, Goble said police had given football players permission to go into the athletic complex to pack for the game.