Tens of thousands of people streamed off university campuses in Texas and North Dakota on Friday after telephoned bomb threats prompted officials to warn students and faculty to get away as quickly as possible. Both campuses eventually were deemed safe and reopened by early afternoon, as authorities worked to determine whether the threats were related.

The University of Texas received a call about 8:35 a.m. local time 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.