Police broke up a pro-Palestinian encampment Tuesday at the University of Michigan.

Officers wearing helmets with face shields moved in before sunrise to clear the Diag, known for decades as a site for campus protests, AP reported.

Video posted online showed police at times using what appeared to be an irritant to spray people, who were forced to retreat.

The encampment had been set up in late April near the end of the school year and as families arrived for spring commencement.

After the camp was cleared, nearby buildings, including the undergraduate and graduate libraries, were closed, and police turned away students who showed up to study.

Protesters have demanded that the school’s endowment stop investing in companies with ties to Israel.

Students and others have set up tent encampments on campuses around the country to press colleges to cut financial ties with Israel. Tensions over the Israeli war on Gaza have been high on campuses since the fall, but demonstrations spread quickly following an April 18 police crackdown on an encampment at Columbia University. Arrests at campuses have surpassed the 3,000 mark nationwide.