Over 100 protesters were arrested Tuesday at Columbia University and City College of New York, according to a law enforcement official.

Most of the arrests were made at Columbia, including about two dozen protesters who police say tried to prevent officers from entering the campus, the official said.

Tactical teams at Columbia first set up a perimeter around the campus to hold back protesters and prevent further arrests, according to the official. Offers then entered the campus through multiple entry points.

A Columbia University spokesman said in a statement the administration decided to call in police in order to restore safety and order to our community.

We regret that protesters have chosen to escalate the situation through their actions, the spokesman said. After the University learned overnight that Hamilton Hall had been occupied, vandalized and blockaded, we were left with no choice.

Columbia University President Minouche Shafik requested in a letter that the NYPD help to clear all individuals from Hamilton Hall and all campus encampments and remain on campus until at least May 17. That would leave in place a police presence past the universitys exam periods and graduation.

A Columbia University faculty group criticized the administrations decision to turn to police, saying faculty members had tried for two weeks to intervene and defuse the situation only to be rebuffed by university leaders.

"NYPD presence in our neighborhood endangers our entire community. Armed police entering our campus places students and everyone else on campus at risk, said a statement from the Columbia University Chapter of the American Association of University Professors.

The faculty further said it would hold the universitys leaders responsible for the disastrous lapses of judgment that have gotten us to this point."

Protesting Israel's war in Gaza and demanding university divestment from the country along with amnesty for demonstrators, students entered Hamilton Hall early Tuesday, hours after the university began suspending students for refusing to take down tents at a nearby protest site.

Hamilton Hall has been central to protests at the university since the 1960s.

White House National Security Council spokesperson John Kirby told reporters Tuesday that President Joe Biden believes students occupying an academic building is absolutely the wrong approach, and not an example of peaceful protest.

Democratic Congressman Jamaal Bowman, who represents a New York district near Columbia University, called on the school to stop what he called a dangerous escalation.

"Educational institutions should be spaces to nurture critical thinking skills and learn to work together with diverse communities to enact a more just and peaceful world, Bowman said in a statement. The militarization of college campuses, extensive police presence, and arrest of hundreds of students are in direct opposition to the role of education as a cornerstone of our democracy."

The Columbia student radio station WCKR reported that all student journalists were escorted away from Hamilton Hall. Still, the student journalists continued to broadcast and report on what was happening.

Due to a significant number of online listeners, WCKR experienced intermittent outages and had to lower its sound quality in order to accommodate increased demand.

Building takeover

Facing calls to resign over how she has handled the protests, Shafik released a statement Monday condemning calls for violence and reiterating the university's commitment to "academic freedom and to ensuring that all members of our community have the right to speak their minds."

Insisting Columbia will not divest from Israel, Shafik said the school has instead "offered to develop an expedited timeline for review of new proposals from the students by the ... body that considers divestment matters."

After smashing through glass door panels and chaining them shut, students draped a banner reading "Hind's Hall" from an upper floor. Protesters have identified Hind as "a 6-year-old Palestinian child murdered in Gaza by the Israeli occupation forces funded by Columbia University."

Israel denies targeting civilians in its war against Hamas, alleging that militants are using civilians as human shields. More than 35,000 Palestinians have been killed in Israel's assault on Gaza, many of whom are women and children, according to Gaza's health ministry.

Israel launched its offensive in response to an Oct. 7 Hamas attack on Israel that killed about 1,200 people and saw some 250 taken hostage.

Three hours after students commandeered Hamilton Hall, Columbia University issued a notice that the campus would be closed to all except for residential students and essential employees.

Nationwide demonstrations

Students have been protesting Israel's war in Gaza on campuses throughout the country. Dozens of students were pepper-sprayed and arrested by police on Monday at the University of Texas at Austin, while students at California State Polytechnic University, Humboldt, in Arcata, California, were detained early Tuesday.

U.N. human rights chief Volker Türk expressed concern over the force being used against protesters throughout the United States, saying, "Freedom of expression and the right to peaceful assembly are fundamental to society."

U.N. Secretary-General Antonio Guterres called it "essential in all circumstances to guarantee the freedom of expression and the freedom of peaceful demonstration."

"Hate speech is unacceptable," he said, adding that it is up to the university authorities to manage the unrest. (Based on reports by CNN and AP)