AUSTIN, Texas (AP) -- The University of Texas says all of its buildings have been cleared and are reopening after a bomb threat prompted an evacuation of the Austin campus.
Meanwhile, North Dakota State University has lifted its evacuation order, and will reopen its campus by 1 p.m. CDT.
The University of Texas posted on its website that all classes have been canceled for the remainder of the day Friday but other university activities will resume by 5 p.m.
The school had issued and alert shortly before 10 a.m. Friday telling people to immediately evacuate all campus buildings and "get as far away as possible" after the school received a phoned-in bomb threat.
Earlier, thousands of people streamed off university campuses in Texas and North Dakota after phoned-in bomb threats prompted evacuations and officials warned students and faculty to get away as quickly as possible. No bombs had been found on either campus by late morning and it was not clear whether the threats were related.
The University of Texas issued received a call about 8:35 a.m. from a man claiming to be with al-Qaida 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 issued another advisory saying all buildings had been cleared. It left open the possibility that classes could resume later Friday.
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.
In Texas, sirens wailed on campus and cellphones pinged with text messages as the alert when out. Students described more confusion than panic as they began to exit 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.
Ashley Moran, a freshman from Houston, said she was waiting to get into class when word quickly began spreading among students to leave immediately.
"It makes me really nervous I just know we're supposed to get out," she said.
With rain falling, students stood under awnings and overhangs and inundated nearby restaurants and coffee shops as they waited to find out when classes would resume
Abby Johnston, a production and special editions coordinator for Texas Student Media, said she received the first text message from the university less than an hour after she arrived at work and started thinking about what she would publish in the next day's paper. Then sirens started blaring.
"We do the siren test once a month and so at first people thought maybe it was just a test, and then we started to tell everybody, 'No actually we have to get out of here pretty immediately,'" said Johnston, 22. "There was definitely a little bit of nervous tension."
Tania Lara, a graduate student at the Lyndon B. Johnson School of Public Affairs, said she was at work inside a central campus academic building when she got a text message to get as far away was possible.
"It was calm but nobody knew what was going on," she said, describing a crush of students heading for the exits. "No one was yelling 'get out of here' or anything like that."
Meanwhile, Valparaiso University in Indiana has warned students on its website and increased security after receiving a vague threat through a graffiti message.
The school says the threat claimed "dangerous and criminal activity" would occur on the northwest Indiana campus during the university's daily chapel break period Friday. The message provided no details.
The school says the FBI and local authorities searched the campus but found nothing suspicious.
University spokeswoman Nicole Niemi said classes and other regular activities were continuing as planned.
The university tweeted that Valparaiso did not receive a bomb threat as schools in Texas and North Dakota did and called its situation "substantially different."
Indiana Homeland Security spokesman John Erickson declined to say if any other Indiana schools had issued similar alerts.
(Copyright 2012 The Associated Press. All Rights Reserved.)
