Police investigated a report of shots fired at Princeton University left a portion of the campus on alert for three hours Tuesday night.
According to a University spokesperson, gunshots were reported at Nassau Hall on the school's campus shortly before 8 p.m.
“Princeton Police have set up a close-in perimeter around Nassau Hall, and University Public Safety officers are at a wider perimeter,” the spokesperson wrote on the school’s Twitter page.
No injuries were reported. Officers from the University's Department of Public Safety, Princeton Police Department and the Mercer County Sheriff's Office were called to the scene and searched the building.
Around 10:30 p.m., the University announced the "all clear" and that officers found nothing during the search.
"They believe reports of gunshots were unfounded," the spokesperson tweeted.
Built in 1756, Nassau Hall is the oldest building on the school's campus and was designated a "National Historic Landmark." It served as the meeting place for several leaders during the Revolutionary War, including George Washington.
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Nassau Hall is located on the northern edge of the campus, close to where the university meets the town of Princeton.