Dozens of pro-Palestinian demonstrators barged into Milbank Hall on Barnard College’s Manhattan campus on Wednesday and staged a sit-in over the expulsion of two students who interrupted a class on Israel, sparking a showdown with Barnard’s administration.

The masked protesters pushed past a security guard as they entered the building at about 4 p.m., video that they shot showed, with the goal of occupying the area outside Dean Leslie Grinage’s office.

A college spokeswoman said in a statement that the protesters had “physically assaulted a Barnard employee, sending them to the hospital” as they entered the building. A Police Department spokesman said that a 41-year-old man had been taken by ambulance to Mt. Sinai Morningside Hospital at 4:08 p.m. complaining of “pain about the body” and was in stable condition.

The sit-in ended Wednesday night after Barnard set a deadline and threatened to take further action, such as calling in the New York Police Department.

Chanting “there is only one solution, intifada revolution” and beating drums, the masked students began their sit-in. Their demands included the immediate reversal of the student suspensions and amnesty for all other students disciplined for pro-Palestinian activism. They also requested a public meeting with Dean Grinage, who they said could decide on appeals of the student suspensions, and with the Barnard president, Laura Rosenbury.

“Disruption until Divestment, Resistance Until Return, Agitation until Amnesty,” Columbia Students for Justice in Palestine, a banned group on campus, posted on X with images of the sit-in. “We will not stop until our demands are met.”