Pro-Palestinian protesters took over part of the Butler Library at Columbia University in New York City on Wednesday, interrupting students studying for finals.

Pro-Palestinian protesters entered Butler Library on Columbia University’s campus bringing NYPD officers to the area to monitor the situation, according to campus and city officials. The protest, which began around 4 p.

The protesters, wearing masks and kaffiyehs, hung banners in the soaring main room of Butler Library’s second floor, renaming the space “the Basel Al-Araj Popular University,” according to the demonstrators and witnesses at the library.