NEW YORK (AP) — The pro-Palestinian demonstration that paralyzed Columbia University ended in dramatic fashion, with police carrying riot shields bursting into a building that protesters took over the previous night and making dozens of arrests. On the other side of the country, clashes broke out early Wednesday between dueling groups at the University of California, Los Angeles.

New York City officers entered Columbia’s campus late Tuesday after the university requested help, according to a statement released by a spokesperson. A tent encampment on the school’s grounds was cleared, along with Hamilton Hall where a stream of officers used a ladder to climb through a second-floor window.

Meanwhile, violence broke out at UCLA overnight between pro-Palestinian and pro-Israeli protesters. Police wearing face shields formed a line but did not immediately intervene.

The clashes took place just outside a tent encampment, where pro-Palestinian protesters erected barricades and plywood for protection — and counter-protesters tried to pull them down.