Threats on social media rattle University of Missouri campus

Concerned Student 1950 member Ayanna Poole celebrates the resignation of University of Missouri President Tim Wolfe.

University of Missouri graduate student Jonathan Butler embraces his mother just moments after University of Missouri President Tim Wolfe announced his resignation. Butler held a hunger strike, saying he would not eat until Wolfe resigned.

University of Missouri graduate student Jonathan Butler celebrates the resignation of University of Missouri President Tim Wolfe with Ayanna Poole, a fellow member of Concerned Student 1950. Butler held a hunger strike, saying he would not eat until Wolfe resigned.

A student reacts to the resignation of University of Missouri President Tim Wolfe.

Students react to the resignation of University of Missouri President Tim Wolfe.

Protesters celebrate after the resignation resignation of Missouri University System President Tim Wolfe on the University of Missouri campus. Wolfe resigned after pressure from students and student athletes over his perceived insensitivity to racism on the university campus.

Members of the student protest group Concerned Student 1950 hold hands at the University of Missouri in Columbia, Mo., after the announcement that System President Tim Wolfe would resign. The football team and others on campus had been in open revolt over his handling of racial tensions at the school.

Jonathan Butler, a graduate student who was on a hunger strike calling for the university president’s removal, addresses a crowd following the announcement that University of Missouri System President Tim Wolfe would resign. Butler has ended his hunger strike.

University of Missouri System President Tim Wolfe, at right, hugs university curator Marcy Graham after announcing his resignation during a Board of Curators meeting Monday at the University of Missouri in Columbia, Mo.

FOR THE RECORD: An earlier version of this caption misidentified Wolfe; he is at right, not center.

Members of the Legion of Black Collegians and the Concerned Student 1950 supporters gather outside the Reynolds Alumni Center after an emotional protest on the University of Missouri campus in Columbia, Mo.

A sign is posted where student protesters have put up tents on the University of Missouri campus Sunday in Columbia, Mo.

Supporters raise their fists in solidarity during a rally at Traditions Plaza on the University of Missouri campus in Columbia, Mo., calling for the resignation of the University of Missouri System President Tim Wolfe. The group organized the rally to draw attention to race relations on campus.

Members of the Concerned Student 1950 and the Legion of Black Collegians link arms during a protest in Mark Twain Dining Hall at the University of Missouri campus in Columbia, Mo.

Supporters of the group Concerned Student 1950 listen to speeches during a rally at Traditions Plaza on the University of Missouri campus in Columbia, Mo., calling for the resignation of the University of Missouri System President Tim Wolfe.

University of Missouri President Tim Wolfe speaks Tuesday with members of Concerned Student 1950 senior Abigail Hollis, from left, senior DeShaunya Ware and junior Shelbey Parnell as they call for Wolfe’s resignation outside University Hall on the University of Missouri campus in Columbia, Mo.