Columbia students reported feeling threatened when masked protesters stormed the campus library, chanted anti-Israel slogans, and mocked the Israeli hostage crisis.

A Columbia official said more than 65 Columbia students were placed on “interim suspension pending further investigation.” A total of 33 people, including from affiliated institutions, were barred from Columbia’s campus. Alumni who joined the demonstration were also barred from campus, the university official said.

A Palestinian student arrested as he was about to finalize his U.S. citizenship is accusing Columbia University of eroding democracy with its handling of protests against the Israel-Hamas war.