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By Phil Helsel

Authorities on the campus of the University of Missouri said they are investigating reports of "social media threats" a day after protesters succeeded in their fight to force the resignation of the college’s president.

Tim Wolfe, president of the University of Missouri, resigned Monday amid mounting criticism of the university’s response to racial incidents on campus.

R. Bowen Loftin, chancellor of the system's flagship campus in Columbia, also announced he would resign at the end of the year.

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The university posted a message to its emergency information Twitter account that "MUPD is investigating reports," but added that there was "no immediate threat" to campus and urged students and others against spreading rumors. Loftin said the university police department has increased security.

Earlier Tuesday, the University of Missouri Police Department said it confirmed that a "phoned-in threat" was made earlier in the day to the Black Culture Center on campus. The building was locked down and searched, but nothing suspicious was found and there were no arrests, police said.

Some dorms on campus were seen to have security notices Tuesday night notifying visitors that only those with identification for the buildings would be allowed inside.