Washington, November 13 (RHC)-- Several professors canceled classes at the historically Black college of Howard University in Washington, D.C., on Thursday, after someone claiming to be a University of Missouri student made a violent threat against Howard students.

The author said on an on-line comment board that he would kill any Black students on Howard’s campus Thursday, writing: "After all, it’s not murder if they’re Black."

In an e-mail message to students, Howard President Wayne Frederick said the university is "aware of the threat" and that security has been increased around campus.

The threats came one day after two white college students were arrested for allegedly posting social media threats against students of color at the University of Missouri. The threats included: "I’m going to stand my ground tomorrow and shoot every black person I see" and "I’m gonna shoot any black people tomorrow, so be ready."