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PRINCETON, N.J. (AP) — Princeton University has reopened its campus after an hours-long search for explosives turned up nothing.

The New Jersey Ivy League university reopened Tuesday evening about eight hours after it received a phoned-in bomb threat against multiple buildings and evacuated its campus and off-campus buildings. Nearly 7,000 people were affected.

Princeton says in a statement the bomb threat was one of a number of threats around the country Tuesday. A university spokesman says he's unaware of anything linking them.

No classes were in session Tuesday, though some summer programs were.