Signs have been posted at the University of California, Berkeley, campus calling for a protest Thursday against right-wing speaker Ben Shapiro. The university will seal off large parts of its campus with a closed perimeter and a "very large" visible police presence. (Associated Press)
University of California, Berkeley, student Bradley Devlin, center, sits with others at a Berkeley College Republicans table on campus in Berkeley, Calif., Thursday, Feb. 2, 2017. Chaos that erupted at the university to oppose right-wing provocateur Milo Yiannopoulos was shocking not just for the images of protesters setting fires, smashing windows and hurling explosives at police, but because of where it took place. (AP Photo/Jeff Chiu)
Protesters hold signs while talking to students and others on the University of California, Berkeley, campus in Berkeley, Calif., Thursday, Feb. 2, 2017. Chaos that erupted at the University of California, Berkeley, to oppose right-wing provocateur Milo Yiannopoulos was shocking not just for the images of protesters setting fires, smashing windows and hurling explosives at police, but because of where it took place. (AP Photo/Jeff Chiu)
Police officers arrest two men who attacked a student on the University of California, Berkeley campus in Berkeley, Calif., Thursday, Feb. 2, 2017. Jack Palkovic, a student wearing a "Make America Great Again" hat, was attacked on the University of California, Berkeley campus a day after violent protests led authorities to cancel a controversial speech. (AP Photo/Jeff Chiu)
In this June 1, 2011, file photo, people walk through Sproul Plaza near the Sather Gate on the University of California, Berkeley campus in Berkeley, Calif. The university suspended a class on Sept. 13, 2016, amid complaints that it shared anti-Semitic viewpoints and was designed to indoctrinate students against Israel. (AP Photo/Eric Risberg, File)
FILE - In this March 15, 2014 file photo, former Secretary of State Condoleezza Rice speaks at the California Republican Party 2014 Spring Convention in Burlingame, Calif. From Rice to the head of the International Monetary Fund and the former chancellor of the University of California, Berkeley, the list of 2014 commencement speakers backing out following student and faculty protests continues to grow. (AP Photo/Ben Margot, File)
University of California, Berkeley student Anastasia Somkin dances to music in the Occupy Cal campsite in Sproul Plaza on the campus of University of California, Berkeley on Nov. 16, 2011, in Berkeley, Calif. (Associated Press)
A University of California, Berkeley policeman stands guard at the Haas School of Business in Berkeley, Calif., on Nov. 15, 2011. A man with a gun was shot by police earlier that day inside the business school, after hundreds of students and anti-Wall Street activists descended on the campus for a day of protests about a half-mile away. (Associated Press)