Student anti-war protesters at U.S. college campuses are digging in and vowing to keep their demonstrations going, while some universities have moved to shut down encampments and protests. Washington University in St. Louis locked some campus buildings and arrested protesters Saturday, including Green Party Presidential Candidate Jill Stein. The University of Southern California says it has temporarily closed its University Park Campus to nonresidents. Police in riot gear cleared an encampment at Northeastern University in Boston, Arizona State University says 69 people were arrested and 23 people were arrested at Indiana University. Columbia University in New York City says students and administrators have engaged in negotiations.