An "all clear" message was issued at 10:30 p.m. by the Princeton University Department of Public Safety after it received a report at 7:55 p.m. of gunshots heard inside Nassau Hall.

The university police department says the building was searched and the no shots were fired.
Princeton University's website says that officers from the  West Windsor, Plainsboro and Lawrence and Mercer County Sheriff office responded.

Nassau Hall is Princeton's administrative center. Princeton's website calls Nassau Hall the centerpiece of its campus and a university and national landmark.

During the Revolutionary War American and British trooped fought a battle at Nassau Hall.

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The Associated Press contributed to this report