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Princeton evacuated after multiple bomb threats

Princeton University evacuated its campus Tuesday after receiving a bomb threat to multiple buildings.

The university announced on its website around 10:25 a.m. that a bomb threat was called in to the New Jersey campus:

There has been a bomb threat to multiple unspecified campus buildings. Please evacuate the campus and all University offices immediately and go home unless otherwise directed by your supervisor.

Drivers and pedestrians were told to leave the campus after the bomb threat was received, the school said on its Twitter account. Those without cars were directed by police to evacuation sites, the school said. 

"This is NOT a test. There has been a bomb threat to multiple unspecified campus buildings,'' said one of the school's tweets.

Regular classes have ended for the academic year, with most students already gone after last Tuesday's commencement. Princeton announced via Twitter on Tuesday that it had sent students, faculty and staff who remained on campus for the summer home or into town for the day, and that local, state, and federal authorities were investigating.

There were about 6,900 people on campus Tuesday morning who were evacuated, including summer programs, high school groups, and athletic programs, Martin Mbugua, a spokesman for the school, said.

Princeton, located in Princeton, N.J., is the fourth-oldest college in the United States. The No.-1 ranked school by U.S. News and World report has about 5,000 undergraduate students and 2,500 graduate students.

NBC News' Katie Tur and Elizabeth Chuck contributed to this report.

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