Ohio State University joined the growing list of college protests against Israel’s war against Hamas in Gaza. Clashes between protesters and police on the campus overnight resulted in over a dozen arrests.

Those who refused to leave after warnings were arrested and charged with criminal trespass, said university spokesperson Benjamin Johnson, citing rules barring overnight events.

As the death toll mounts in the war in Gaza and the humanitarian crisis worsens, protesters at universities across the country are demanding schools cut financial ties to Israel and divest from companies they say are enabling the conflict. Some Jewish students say the protests have veered into antisemitism and made them afraid to set foot on campus, partly prompting the calls for police intervention.

Saar Noy Zylberman, a Jewish student at Columbia University in New York City who grew up in Israel, told CBS News correspondent Nancy Chen on Thursday that many students knew people at the music festival that was targeted in Hamas’ deadly terror attack last year.

“And adding to that the situation where people scream hateful speech who have harassed and attacked both verbally and physically people, it’s just making it impossible to be here,” Zylberman told Chen.

New York City Mayor Eric Adams said police officers were hit with bottles and other objects at some of this week’s protests. He blamed outside agitators for joining in with genuine protesters. Officials at Emory University in Atlanta and the University of Texas at Austin have said that not everyone at their schools’ protests were students and that outside groups initiated or joined the demonstrations.

At Emory, local and state police swept in to dismantle an encampment Thursday. Some officers carried semiautomatic weapons, and video shows officers appearing to use a stun gun on one protester they had pinned to the ground. The university said late Thursday that objects were thrown at officers and they deployed “chemical irritants” as a crowd control measure.

Jail records showed 22 people arrested by Emory police were charged with disorderly conduct. Emory said it had been notified that 28 people were arrested, including 20 members of the university community, and some were released.

In Texas, the UT Austin campus was much calmer Thursday after 57 people were jailed and charged with criminal trespass a day earlier, when state troopers in riot gear and on horseback bulldozed into protesters.

Both police and protesters have at times crossed a line, said Greg Lukianoff, the president of the Foundation for Individual Rights and Expression.

“You don’t have a generalized First Amendment right to, you know, turn the public area of a campus into a camping ground,” Lukianoff told CBS News. “But definitely we’ve seen at places like Emory and places like UT Austin, police taking things much, much too far.”

At UT Austin, officials have since pulled back barricades and allowed demonstrators onto the main square beneath the school’s iconic clock tower. The Travis County Attorney’s Office, which prosecutes misdemeanor crimes, dropped 46 cases stemming from Wednesday’s protests after finding deficiencies in the probable cause affidavits, a spokesperson said in a statement.

Most detained demonstrators have not been charged with violent offenses, but there have been several instances of threatening and abusive behavior.

After a tent encampment popped up Thursday at Indiana University Bloomington, police with shields and batons shoved into protesters and arrested 33. Hours later at the University of Connecticut, police tore down tents and arrested one person.

The clock is ticking as May commencement ceremonies near, putting added pressure on schools to clear demonstrations. At Columbia, protesters defiantly erected a tent encampment where many are set to graduate in front of families in just a few weeks.

Columbia officials said that negotiations were showing progress as the school’s self-imposed early Friday deadline to reach an agreement on dismantling the encampment came and went. Nevertheless, two police buses were parked nearby and there was a noticeable presence of private security and police at entrances to the campus.

“We have our demands; they have theirs,” said Ben Chang, a spokesperson for Columbia University, adding that if the talks fail the university will have to consider other options.

Just past midnight, a group of some three dozen pro-Palestinian protesters handed out signs and started chanting outside of the locked Columbia University gates. They then marched away as at least 40 police officers assembled nearby.

On Friday morning, hundreds of counterprotesters gathered on the streets outside Columbia, many holding Israeli flags and chanting for the hostages being held by Hamas and other militants to be released.

California State Polytechnic University, Humboldt, has been negotiating with students who have been barricaded inside a campus building since Monday, rebuffing an attempt by the police to clear them out. Faculty members met with protesters Thursday to try to negotiate a solution as the campus remains shut down at least through the weekend.

A dean at the school, Jeff Crane, suggested during the meeting that the university form a committee that would include students to do a deep dive into the school’s investments. Crane also suggested faculty and students continue meeting every 24 hours to keep an open line of communication. The sides have yet to announce an agreement.

The school’s senate of faculty and staff demanded the university’s president resign in a vote of no confidence Thursday, citing the decision to call police in to remove some barricaded students Monday.

On the other end of the state, the University of Southern California canceled the school’s May 10 graduation ceremony. The announcement was made a day after more than 90 protesters were arrested on campus. The university said it will still host dozens of commencement events, including all the traditional individual school commencement ceremonies.

Tensions were already high after USC canceled a planned commencement speech by the school’s pro-Palestinian valedictorian, citing safety concerns.

At the City College of New York on Thursday, hundreds of students who were gathered on the lawn beneath the Harlem campus’ famed gothic buildings erupted in cheers after a small contingent of police officers retreated from the scene. In one corner of the quad, a “security training” was held among students.

Elsewhere in the city, around a dozen protesters spent the night in tents and sleeping bags inside a building at the Fashion Institute of Technology. The institute’s museum, which is located in the building where the demonstrators set up camp, was closed Friday.

Protesters also stayed overnight at the encampment at George Washington University, according to local news stations. In a statement after the Thursday evening deadline to disperse, the university in Washington said the encampment violated university policies and that the administration and police were figuring out how to address the situation.

At Emerson College in Boston, 108 people were arrested at an encampment by early Thursday. Video shows police first warning students in an alleyway to leave. Students linked arms to resist officers, who moved forcefully through the crowd and threw some protesters to the ground.

“As the night progressed, it got tenser and tenser. There were just more cops on all sides. It felt like we were being slowly pushed in and crushed,” said Ocean Muir, a sophomore.

Muir said police lifted her by her arms and legs and carried her away. Along with other students, Muir was charged Thursday with trespassing and disorderly conduct.

Boston police said four officers suffered injuries that were not life-threatening during the confrontation.

Since the Israel-Hamas war began, the U.S. Education Department has launched civil rights investigations into dozens of universities and schools in response to complaints of antisemitism or Islamophobia. Among those under investigation are many colleges facing protests, including Harvard and Columbia.