By Cedar Attanasio, Jake Offenhartz and Jonathan Mattise | Associated Press
NEW YORK — Large numbers of New York City police officers began entering the Columbia University late Tuesday as dozens of pro-Palestinian protesters remained on the campus.
Demonstrators had occupied Hamilton Hall hours earlier after setting up an encampment earlier in the month.
Students had defiantly set up tents again after police cleared an encampment at the university on April 18 and arrested more than 100 people.