More than 100 people were arrested and four police officers were injured early Thursday when protesters clashed with Boston police as a pro-Palestinian encampment at Emerson College was cleared. The encampment in Boylston Place Alley was one of several set up by students at Massachusetts colleges to show solidarity with the pro-Palestinian protesters who were arrested at Columbia University in New York earlier this week.An Emerson student said an announcement was made at 1 a.m. in the encampment, which is off Boylston Street, saying anyone in the alley would be arrested. "Officers on scene observed a large number of individuals and tents in the area that were blocking access to the right of way and creating various fire and public safety hazards," police spokesperson Mariellen Burns said in a statement. "The group was notified again that they were welcome to exercise their First Amendment rights, but must remove the tents, clear the public way and cease the noise and other activity that was detracting from a safe and peaceful protest."Boston police officers walked out of the Massachusetts Transportation Building at 2 a.m. and made their way through the crowd in the alley.Video from the scene showed dozens of officers in the area, many of whom were wearing protective gear."I saw one student get shoved to pavement and hands behind them. Protesters seemed compliant -- not fighting back or acting violent," Emerson student Kyle Graff said.Another student who was at the demonstration and left the area said he watched the incident unfold from his dorm window and said he saw officers dragging away some people who resisted arrest."Being there and seeing the people standing around, getting dragged to the ground, getting arrested, it was horrifying. It was absolutely disgusting. I am still shaking from the experience," the student said. Boston Police Department spokesman Sgt. John Boyle said 108 people were arrested and are expected to be arraigned in Boston Municipal Court. Hearings are expected to be held on May 1 or 8. Of the four police officers injured, one suffered serious but non-life-threatening injuries. Boston police released body camera video what shows the moment officers approached the protesting students. An officer is heard repeatedly telling the group that they don't want to make arrests, but the area needs to be cleared."We don't want to arrest anybody. We support your right to protest. I'm indifferent. I don't have a side either way. I want you to be able to peacefully do this," the officer said. "At this point it is late. People live here. We've been getting a lot of complaints."Video below: Police body camera shows encounter with protesters Classes at Emerson College have been canceled for Thursday."Emerson College recognizes and respects the civic activism and passion that sparked the protest in Boylston Place Alley in support of Palestine while also holding and communicating concerns related to the numerous ordinance violations caused by their encampment. We also understand that clearing the encampment has significantly and adversely impacted our community," Emerson College President Jay Bernhard wrote in a letter to the community.Boylston Place Alley is not solely owned by Emerson College and it is a fire alley with a public right of way requirement to access non-Emerson buildings, including the State Transportation Center.Just outside the alley, several police vans were parked to take away protesters, and crime scene tape was placed to cordon off the area."The individuals who set up a tented encampment in the Boylston Place area were notified multiple times by Emerson College and the Boston Police that they were violating the City’s encampment ordinance, along with several provisions of the fire code, and could be subject to arrest. The location includes college students, residents and businesses requiring access through the encampment area," Burns said in a statement. "These notifications to the protestors took place in various ways over the past few days, including multiple efforts in the hours and minutes leading up to the arrests that took place." Demonstrators have been urging college officials to support a ceasefire in Gaza and divest from companies and institutions that support Israel. The removal at Emerson comes hours after pro-Palestinian protesters set up another encampment at Harvard Yard. The ACLU said colleges are walking a tightrope balancing First Amendment rights and campus safety."We've been urging campus administrators and law enforcement to exercise restraint in interfering with student demonstrations and encampments," said Carol Rose, of the ACLU. "These are hard times for colleges and universities. Trying to balance the legal requirement that they ensure education free of discrimination at the same time to ensure the free speech rights of students."Harvard University is only allowing people with campus IDs onto Harvard Yard and there are signs indicating tents and tables are not allowed without proper permission.At MIT, police are on standby but no arrests have been made thus far in connection with the protests, nor have any threats been reported.Video Below: Police arrest protesters at Emerson