Pro-Palestinian protesters at Columbia University occupied a hall on campus early Tuesday, hours after school officials ordered the dispersal of a protest encampment.

Videos viewed by ABC News appeared to show protesters creating a barricade with metal chairs outside Hamilton Hall after midnight.

Several were seen in the videos unrolling protest posters from one of the building's balconies.

It was unclear how many demonstrators had occupied the hall, which is on Amsterdam Avenue. The Columbia Spectator, a campus newspaper, reported the people who were inside were working to block the building's exits with tables, chairs and zip-ties.

-ABC News’ Jessica Gorman, Felicia Alvarez and Kevin Shalvey

After police and protesters clashed on the campus of the University of Texas at Austin following a dispersal order, leading to some arrests on Monday, the school issued a statement, saying it "took swift action to preserve a safe, conducive learning environment for our 53,000 students as they prepare for final exams."

"UT Austin requested backup assistance from the Texas Department of Public Safety to protect the safety of the campus community and enforce our Institutional Rules, such as the rule that prohibits encampments on campus. Because of the encampments and other violations of the University’s Institutional Rules related to protests, protestors were told repeatedly to disperse. When they refused to disperse, some arrests were made for trespassing. Others were arrested for disorderly conduct," the university's statement read.

UTA said protests since the start of the Israel-Hamas war have happened "largely without incident."

"The University strongly supports the free speech and assembly rights of our community and we want students and others on campus to know that protests on campus are fully permissible, provided that they do not violate Institutional Rules or threaten the safety of our campus community," the statement concluded.

-ABC News' Marilyn Heck

"Multiple arrests" were made at Virginia Commonwealth University Monday night, following tense conflict between police and pro-Palestinian protesters on the Richmond campus, officials said.

Addressing the arrests, the university said in a statement that final exams start this week and the school "must provide students the opportunity to safely and successfully complete the semester.

"The gathering violated several university policies. VCU respectfully and repeatedly provided opportunities for those individuals involved -- many of whom were not students -- to collect their belongings and leave," the university's statement continued. "Those who did not leave were subject to arrest for trespassing. While supporting an environment that fosters protected speech and expressive activity, VCU must maintain an atmosphere free of disruption to the university’s mission."

-ABC News' Beatrice Peterson and Davone Morales

A representative from Columbia University said the school began suspending students who have defied the 2 p.m. deadline to leave the encampment.

Ben Chang, the vice president of the office of public affairs, did not say how many people would be suspended but said those students would not be able to attend classes or graduate.

"Students who agree to leave and sign a form committed to abide by university policies will be allowed to complete the semester," he said.

The school's campus is still closed to anyone who doesn't have a student ID.

Chang reiterated that the negotiations with the groups protesting were being done in good faith until discussions broke down.

"We were hopeful and were disappointed when the student protesters could not reach a consensus in the discussion," he said.

-ABC News' Darren Reynolds

University of California President Michael V. Drake addressed the ongoing protests at UCLA that "turned violent" overnight, announcing in a statement on Wednesday an "independent external review" has been ordered.

The university summoned mutual aid from LAPD officers to "restore control" to the protest, according to Drake, who noted, there were 15 injuries, including one hospitalization, that stemmed from the protest.

"My office has requested a detailed accounting from the campus about what transpired in the early morning hours today," Drake said.

"But some confusion remains, therefore we are also ordering an independent external review of both UCLA’s planning and actions, and the effectiveness of the mutual aid response," Drake said.

UCLA's own chancellor, Gene D. Block, also promised an investigation.

"We are still gathering information about the attack on the encampment last night, and I can assure you that we will conduct a thorough investigation that may lead to arrests, expulsions and dismissals," Block told the campus community in a note Wednesday afternoon.

Block, in his note, said it was "a group of instigators" who came to Royce Quad to "forcefully attack the encampment that has been established there to advocate for Palestinian rights."

He called the overnight violence "utterly unacceptable."

"However one feels about the encampment, this attack on our students, faculty and community members was utterly unacceptable. It has shaken our campus to its core and — adding to other abhorrent incidents that we have witnessed and that have circulated on social media over the past several days — further damaged our community’s sense of security," his letter read.