Police officers at the University of Arizona in Tucson removed an unauthorized encampment on campus early Friday, hours before the school’s scheduled graduation ceremony, school officials said.

The encampment structure, reportedly made from “wooden pallets and other debris,” was erected on campus property after 5 p.m. on Thursday against campus policy, the school said in a statement.

Officials said that they warned the protesters to remove the encampment and disperse, but the warnings…