NEW YORK (AP) — The pro-Palestinian demonstration that paralyzed Columbia University ended in dramatic fashion. Police carrying riot shields burst into a building late Tuesday that protesters took over the previous night and made 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. A university spokesman said New York City officers entered Columbia’s campus after the school requested help. A tent encampment on the school’s grounds was cleared, along with Hamilton Hall. Protesters calling on the Ivy League university to stop doing business with Israel or companies that support the war in Gaza seized the hall about 20 hours earlier.