About 20 male students allegedly streaked through an ECO 101: Introduction to Macroeconomics lecture on Thursday morning in McCosh 50.
The 20 individuals were allegedly wearing nothing but scarfs, ski masks and sneakers, University spokesperson Martin Mbugua said.
The incident was reported to the Department of Public Safety at 11:15 a.m. DPS is still investigating the report, and none of the individuals have been identified. The males immediately left the room.
Streaking through large lectures is a common pledge exercise for some fraternities on campus, although it is unclear if DPS has been called in to investigate the matter in the past. Pledge members, who are sophomores, must complete a series of challenges before being initiated into frats. It remains unclear which, or how many frats, currently make their pledges streak in one way or another in order to obtain membership.
Lewdness is a disorderly persons offense in New Jersey.
The University banned freshmen from joining fraternities or sororities in 2012.