Police are investigating reports of gunshots fired on Princeton campus near Nassau Hall, which houses the president’s office and is the oldest building on campus. Local EMTs have not been summoned and no injuries have been reported, according to the The Daily Princetonian. Initial reports of gunshots started around 7:55 pm. Between 9:13 and 9:20, police formed a close-in perimeter Nassau and Public Safety officials are stationed around a wider area, reported the Daily Princetonian’s Twitter account. Helicopters have also been witnessed overhead.

An email alert sent out to all students and faculty with the subject, “Report of Gunshots in Nassau Hall,” advised to “Stay away from area. Updates to follow.” The campus will remain in lockdown until further information can be gathered. A voice mail sent to all student and faculty repeated earlier reports and gave similar caution.

Ezra Klein, journalist from The Washington Post, was on campus giving a lecture when reports broke of the gunshots. Students attending the lecture were evacuated to the basement of Whig Hall, which is separated from Nassau Hall by Canon Green.

Update 9:55: The lockdown is over and students are now able to walk campus, although Nassau Hall continues to be cordoned off. A text alert from Princeton: “Police are still on the scene. No injuries reported. Stay away from Nassau Hall.”

Update 10:25: Police issued “All clear” statement. Police have searched the building, found nothing.