Police entered the campus encampment early Tuesday, WLS reported.
Protests have broken out at colleges and universities across the country in connection with the war in Gaza.
Many pro-Palestinian protesters are calling for their colleges to divest of funds from Israeli military operations, while some Jewish students on the campuses have called the protests antisemitic and said they are scared for their safety.
The student protests -- some of which have turned into around-the-clock encampments -- have erupted throughout the nation following arrests and student removals at Columbia University in New York City. Students at schools including Yale University, New York University, Harvard University, University of Texas at Austin, University of Southern California and more have launched protests.
Four police officers were injured at the University of Wisconsin-Madison where police were dispersing an encampment of protesters on the Library Mall.
Three of the four officers sustained injuries "directly related to the physical resistance," according to the university. A state trooper sustained injuries when a protester allegedly "struck their head with a skateboard."
Columbia University President Minouche Shafik said that tensions on campus had "rose to new heights" when a group of protesters broke into Hamilton Hall and barricaded themselves. Shafik said it pushed the university "to the brink," according to a letter sent to the Columbia University community Wednesday.
"I know I speak for many members of our community in saying that this turn of events has filled me with deep sadness. I am sorry we reached this point," Shafik said.
The NYPD said it arrested 119 people at Columbia Tuesday night, but it has not yet revealed how many of those arrested are students.
"The University offered to consider new proposals on divestment and shareholder activism, to review access to our dual degree programs and global centers, to reaffirm our commitment to free speech, and to launch educational and health programs in Gaza and the West Bank. Some other universities have achieved agreement on similar proposals. Our efforts to find a solution went into Tuesday evening, but regrettably, we were unable to come to resolution," Shafik said.
Negotiations broke down between the university and members of the encampment after Columbia refused to divest from companies linked to Israel and the war in Gaza.
The University of California, Los Angeles announced that it will cancel all Wednesday classes due to the "distress caused by the violence that took place on Royce Quad" overnight, according to a statement from the university.
The hospital and health system, the Luskin Conference Center and PreK through 12 schools will remain open.
"We have law enforcement presence stationed throughout campus to help promote safety. Student Affairs will have essential staff on campus to support our students who have been impacted by this tragedy," UCLA said in a statement.
At least 12 people have been arrested at the University of Wisconsin-Madison as campus police moved to disperse an encampment of protesters. About 100 to 200 people had arrived for a demonstration Monday and began putting up tents.
The University of Wisconsin said several people resisted arrest, but it is not yet clear how many of the arrested are affiliated with the university.
Several tents have been taken down and dissembled.
"Tents and camping are not allowed on any university property under Chapter 18 of the Wisconsin Administrative Code, which defines the types of activities permitted on campus, information which was shared to all members of the campus community on Friday," the university said in a statement.
