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

Dozens of protesters stood on tables, beat drums and unfurled pro-Palestinian banners in the main reading room of a Columbia University library on Wednesday in one of the biggest demonstrations at the school since its New York City campus was roiled by a student protest movement last year.

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.