Interim Chancellor Brad Colwell also asked students in an email to not distribute the YouTube video, in which a masked speaker attributes the message to the campus' Alpha Tau Omega fraternity. The fraternity has denied involvement.
The video's release follows a black student's complaint at a recent Carbondale campus residence hall forum. The student said Republican presidential candidate Donald Trump's student supporters used a racial slur and said black students should "go back to Africa.''
The school is investigating that incident, which prompted another open letter from Colwell.
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