Cheryl Elliott, Emory University's vice president for public safety, provided an update to the school community on the incident that took place between police and pro-Palestinian protesters.

Elliot addressed the viral video of officers using a stun gun on one of the protesters when the encampment was dispersed and said the person in the video did not appear to be affiliated with Emory.

"Based on current information, this individual is not a member of the Emory community," Elliot said.

Elliot said, "Due to the direct assault of officers, law enforcement released chemical irritants into the ground to assist with crowd control."

Twenty-eight people were arrested during the incident, 20 of whom were affiliated with the university, according to Elliot.

"We are working with responding agencies to expedite the release of any Emory community members who remain in custody," she said in her letter to the Emory community.

-ABC News' Cherise Rudy

Columbia University said it is enhancing security along the campus' perimeter after it was made aware of several "potentially significant" protests planned outside the gates of its Manhattan campus Thursday evening.

The New York City Police Department is adding officers "to maintain safety" and people are being asked to avoid the area, the university said in a message to the school community. The protests are expected to start around 6 p.m. ET., it said.

The campus remains restricted to Columbia University ID holders.

The university is in formal discussions with student protesters regarding dismantling an encampment on campus, a university spokesperson said.

Demonstrators who were arrested Wednesday at the University of Texas will not be facing charges at this time and have been ordered released due to deficiencies in probable cause, according to the Travis County Attorney’s Office.

Fifty-five people were arrested -- 26 of whom were unaffiliated with UT Austin -- the university said Thursday.

"This outside group presence is what we've seen from the affiliated national organization's efforts to disrupt and create disorder," the university said in a statement.

The attorney's office said it received several cases Wednesday after the demonstration at UT Austin.

"Legal concerns were raised by defense counsel. We individually reviewed each case that was presented and agreed there were deficiencies in the probable cause affidavits. The Court affirmed and ordered the release of those individuals. We will continue to individually review all cases presented to our office to determine whether prosecution is factually and legally appropriate," the Travis County Attorney's Office said in a statement.

Northeastern University in Boston said it will "take action accordingly" against pro-Palestinian protesters demonstrating on its Centennial Quad on Thursday.

"The quads on Northeastern's Boston campus are reserved by the division of Student Life for scheduled university events," a university spokesperson said in a statement. "Students currently demonstrating on Centennial Quad do not have authorization and are in violation of the Code of Student Conduct. Those who are not affiliated with Northeastern are trespassing. The university will take action accordingly."

Andrew T. Guzman, the provost and senior vice president for Academic Affairs at the University of Southern California, sent a letter to the school's students, faculty and other members with an update on the situation taking place on campus.

Guzman reiterated the university "values freedom of expression and protects the right of every member of our community to express themselves," but added, "We have well-established policies regarding limits on the time, place, and manner of free expression."

Guzman said the call to shut down the campus stemmed from a confrontation between protesters outside the Doheny Library and security. Security members asked the protesters, many of whom Guzman said weren't affiliated with USC, to leave and remove tents they set up, but the protesters refused, according to the school.

"Their actions have escalated to the point of confrontation and have threatened the safety of our officers and campus community," Guzman said.

Until further notice, only people with "USC identification or verifiable business purpose will be able to access campus, attend classes, and participate in activities" will be allowed on campus, according to Guzman.

"In these challenging times, we call on the Trojan Family to remember that every member of our community is deserving of respect, has the right to be safe on campus, take classes, and participate in other campus activities without fear of harassment or bullying. It should be everyone’s priority to treat each other with kindness and care," he said.

-ABC News' Jenna Harrison