Students at the University of Minnesota Twin Cities campus are being urged to walk out of class Tuesday afternoon. An encampment set up was quickly torn down by police on the University mall Tuesday morning. It mirrors encampments at college campuses across the country.Encampment organizers want the university to sever financial ties with companies that do business with the Israeli military, including Lockheed Martin, Honeywell and General Dynamics.According to a statement from the university, campus police told those present they were in violation of University policy and state trespassing law, because tents are not allowed on any University property for any purpose without a permit. Campus police took down the tents and arrested nine students who did not leave. Those students are being held in the Hennepin County Jail. Students plan to continue protesting the university’s involvement with companies tied to the Israeli military Tuesday afternoon, with a walk-out on campus.MPR News host Cathy Wurzer spoke to the University of Minnesota professor Eric Van Wyk. He’s the chair of the Academic Freedom and Tenure Committee, and shed some light on student speech and protest at the University of Minnesota.