ANN ARBOR, Mich. (AP) — Police broke up a pro-Palestinian encampment Tuesday at the University of Michigan, less than a week after demonstrators showed up at the home of a school official and placed fake body bags on her lawn.

Officers wearing helmets with face shields moved in before sunrise to clear the Diag, known for decades as a site for campus protests. 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. Posters taunting President Santa Ono and other officials were also displayed.

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.