In a message to the campus community Monday, Massachusetts Institute of Technology President Sally Kornbluth gave students until 2:30 p.m. to leave the encampment on campus.

However, protesters remained in the area until after the deadline. It's unclear if police will move in and make arrests.

"In short, this prolonged use of MIT property as a venue for protest, without permission, especially on an issue with such sharp disagreement, is no longer safely sustainable," Kornbluth said.

The encampment on MIT’s campus, on the Kresge lawn, has been ongoing for more than two weeks, according to Kornbluth.

Police moved in on an encampment at the University of California, San Diego early Monday morning, dismantling it and arresting 64 people, according to authorities.

There were 40 students among those arrested, with officials saying they "have been or will be placed under immediate interim suspension."

All classes were moved to remote learning and nonessential personnel were asked to remain home.

Several dozen protesters were detained on UCLA’s campus Monday morning, according to Los Angeles ABC station KABC.

University officials said all classes would be held remotely Monday “due to ongoing disruptions,” and police would be stationed around campus.

Harvard University students who continue to take part in the pro-Palestinian protest encampment at the school will be “referred for involuntary leave,” the university’s interim president, Alan M. Garber, said Monday.

In a letter to the student body, Garber called on protesters “to end the occupation of Harvard Yard,” arguing that the encampment “favors the voices of a few over the rights of many who have experienced disruption in how they learn and work at a critical time of the semester.”

Students placed on involuntary leave “may not be able to sit for exams, may not continue to reside in Harvard housing, and must cease to be present on campus until reinstated,” he wrote.

“As an academic institution, we do not shy away from hard and important questions,” Garber wrote. “There are many ways for our community to engage constructively in reasoned discussion of complex issues, but initiating these difficult and crucial conversations does not require, or justify, interfering with the educational environment and Harvard’s academic mission.”

-ABC News' Julia Reinstein

At least 25 people were arrested at CUNY's City College of New York campus as police confronted protesters early Wednesday, the university said in a statement.

University officials said they asked the New York Police Department for assistance in clearing protesters, including a "large crowd" of people who had marched from Columbia University to City College.

The school described a "series of violent indents" that it said put public safety at risk over the last six days.

"This includes a fire Sunday night at the Marshak Science Building caused by use of a flare gun that brought FDNY to campus, clashes with public safety, an attempted break-in at Shepard Hall tonight, and a break-in at the Administration Building tonight that included the vandalizing of offices and smashing glass doors," the university said in a press release early Wednesday.

Police entered the campus just before midnight and began making arrests, the university said.

"Students have a right to demonstrate peacefully and exercise their First Amendment rights," the university said. "Tonight's actions were taken in response to specific and repeated acts of violence and vandalism, not in response to peaceful protest"

-ABC News' Jessica Gorman and Kevin Shalvey