Large numbers of New York City police officers begin entering Columbia University campus

NEW YORK (AP) — Large numbers of New York City police officers entered Columbia University late Tuesday, hours after the mayor said a pro-Palestinian protest that has crippled the Ivy League school for two weeks “must end now.”The scene unfolded shortly after 9 p.m. as police, wearing helmets and carrying zip ties and riot shields, massed at the Ivy League university's entrance. The demonstrators had occupied Hamilton Hall, an administration building on campus, more than 12 hou